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---
name: reui
description: Use the ReUI registry from your AI agent - find, install, and correctly use ReUI components (the 17 free building blocks like data-grid, kanban, filters), their free examples, premium blocks, and Motion Icons. Applies in any project using ReUI, the @reui registry, REUI_LICENSE_KEY, or any shadcn project where the user asks for premium blocks, data grids, kanban boards, dashboards, or full pages. Pairs with the free ReUI MCP server for live, scored registry search and inline component APIs.
user-invocable: false
allowed-tools: Bash(npx shadcn@latest *), Bash(pnpm dlx shadcn@latest *), Bash(bunx --bun shadcn@latest *)
---
> **ReUI skill version `42d70dcc3d`.** If the ReUI MCP's `get_agent_skill` reports a newer `version`, re-run the ReUI installer (see `get_agent_skill` -> `install.recommended`) to update this skill. Cloud/tools-only agents have no local file and always read the latest - they can ignore this.
# ReUI for Agents
ReUI is a shadcn-compatible registry. It ships four things you **reuse** - never redesign:
- **components** - the 17 ReUI building blocks with real APIs: `data-grid`, `kanban`, `filters`, `date-selector`, `tree`, `stepper`, ... (free)
- **examples** - free `c-*` single-pattern use-cases of a component (`c-kanban-1`); install one and read it to see exact composition
- **blocks** - premium full-page sections that compose components (`data-grid-2`, `pricing-page-1`); Pro or Ultimate license at install
- **icons** - Motion Icons in 4 styles, static + hover-animated variants; Ultimate license at install
The skill is free and this MCP is free to use; it just needs a ReUI account. On first use your agent opens a browser "Sign in with ReUI" prompt (a free account is created if you don't have one). Free covers components and examples with a daily request allowance; a Pro or Ultimate license unlocks premium blocks and Motion Icons and removes the limit (see [rules/registry.md](./rules/registry.md)). The same account and skill work in every agent and service the MCP connects to - this skill is agent-agnostic.
Skill + MCP are a team: this skill is the workflow (how to find, install, read the API, and adapt by reuse); the MCP is the live data and the hands (search, get_component, install commands). Your job: find the right item, install it with the shadcn CLI, read its real API, and **adapt by reuse** - wire real data and theme it; do not hand-roll or restyle what ReUI already provides. This skill **layers on the shadcn skill**: follow that for generic rules (spacing, `cn()`, semantic colors, forms); follow this for everything ReUI-specific.
## The core loop (MCP-native)
1. **Find** - call the ReUI MCP `search` tool with the user's intent. It returns a ranked, scored list across components/examples/blocks/icons, each with an `install` command, `previewUrl`, `docsUrl`, and `componentsUsed`. Pass hints (`type`, `component`, `category`, `features`, `free`) when you can infer them.
2. **Install** - run the returned command non-interactively (`npx shadcn@latest add @reui/<name> --yes`). The CLI resolves deps, aliases, and the base/style from `components.json`. See [cli.md](./rules/cli.md).
3. **Read the API (on your base)** - first note your base from `components.json` -> `style` (`base-nova` -> Base UI, `radix-nova` -> Radix UI). For each component an item uses, call `get_component(name)` and read its **inline `api`** (no web fetch); then `get_examples(name)` to install a worked example and copy its composition - the installed files are already in your base. Whenever you work with a component's API, also **share its `docsUrl`** (the primitive's API documentation page) with the user so they have the full reference. See [components.md](./rules/components.md).
4. **Adapt (reuse-first)** - swap demo data for real data, fix icon imports, align tokens. Do not redesign. See [adapting.md](./rules/adapting.md).
**Always show the preview.** Every item a tool returns carries a `previewUrl` (a live preview page). Whenever you list, recommend, or present ReUI items to the user - blocks, components, examples, or icons, whether from `search`, `search_icons`, `list_components`, `compose_page`, or any getter - include each item's `previewUrl` so they can SEE it before installing. Blocks and examples open an individual live preview; icons and components link to their live category/component page. Never present an item without its preview link.
If the ReUI MCP is not configured, fall back to `npx shadcn@latest search @reui -q "..."` then `add` - but the MCP gives scored matches + inline APIs; prefer it.
## Commands
Run ReUI as explicit slash commands (via the ReUI MCP) **or** just ask in plain language - both run the same workflow.
| Command | Invoke | Does |
| ----------- | ------------------------------ | ------------------------------------------------------------------------------------------------------------------ |
| **build** | `/mcp__reui__build <what>` | Compose a page/section/feature from ReUI: plan → install → read API → adapt → craft → audit. |
| **add** | `/mcp__reui__add <item>` | Find & install one component/example/block/icon and wire it in. |
| **fix** | `/mcp__reui__fix [target]` | Diagnose & fix ReUI usage: wrong/undocumented props, base/radix mismatch, missing states, a11y/scroll. |
| **improve** | `/mcp__reui__improve [target]` | Refine + extend existing ReUI UI to a production-exceptional bar (hierarchy, density, states, responsive, motion). |
Invocation differs slightly per agent (`/mcp__reui__build` in Claude Code/Cursor/Windsurf, `/mcp.reui.build` in VS Code). No command surface? Just describe what you want - this skill drives the identical loop.
## When to reach for ReUI vs plain shadcn
| Need | Reach for |
| -------------------------------------------------------------------- | ------------------------------------------------------------------------- |
| A full page or section (dashboard, billing, auth, pricing, settings) | `compose_page` first (plans sections + best blocks), then ReUI **blocks** |
| A data table with sorting/filtering/pagination/virtualization | the **data-grid** component (never hand-roll a `<table>`) |
| A drag-and-drop board | the **kanban** component |
| Advanced column filtering, date range, tree, stepper, ... | the matching ReUI **component** |
| A single generic control already in shadcn (Button, Dialog, Select) | plain **shadcn** |
## Detailed references
- [rules/registry.md](./rules/registry.md) - the four types, the @reui registry, base/radix, free vs premium + license
- [rules/workflow.md](./rules/workflow.md) - the find -> install -> read-API -> adapt loop (most important)
- [rules/components.md](./rules/components.md) - the 17 components, the data-grid contract, base vs radix
- [rules/adapting.md](./rules/adapting.md) - reuse-first: preserve the design (no over-customizing), reuse examples + a block's own elements, real data, don't invent APIs
- [rules/craft.md](./rules/craft.md) - make it exceptional: point of view, hierarchy, density, states, responsive, motion, the bar
- [rules/quality.md](./rules/quality.md) - security, accessibility, and scroll gates (the done gate)
- [rules/styling.md](./rules/styling.md) - ReUI extended tokens, theme adaptation, density
- [rules/icons.md](./rules/icons.md) - portable icons, swapping imports, Motion Icons (static + animated)
- [tools.md](./tools.md) - the ReUI MCP: golden path, the 19 tools, token rules, result shapes, errors
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# Adapting installed ReUI code (reuse-first, no AI slop)
ReUI items ship production-quality. Your job is to **adapt by reuse** - wire real data and fit the app - not to redesign or hand-roll. The output should look like ReUI built it for this product.
## Preserve the design - don't over-customize
The design IS the product. A ReUI block/component encodes senior-designer decisions: spacing, hierarchy, density, color treatment, and component choices. The fastest way to turn a premium block back into generic AI slop is to "improve" its look - so don't.
- Change **data, copy, and props**; keep the **structure and styling** it ships with. Make the **smallest** change that wires the real data. If your diff touches `className` / JSX structure more than data / props, you are over-customizing - stop and reuse.
- Don't swap ReUI components for hand-rolled ones, restructure the layout, re-skin spacing / radius / colors, or add decorative chrome. Let the installed components carry the default spacing, radius, sizing, icon rhythm, density, and state styling; add custom Tailwind only when a component genuinely lacks a contract you need.
- Want a different look? `search` for a block whose design already fits and reuse that - don't restyle this one into a new design.
## Reuse the parts: examples and the block's own elements
- **Examples are building parts.** A free `c-*` example is a correct, single-pattern composition you can reuse. Before composing from scratch, `get_examples(component)`, install the closest one, and reuse its wiring - assemble UI from examples instead of hand-rolling what an example already shows.
- **Reuse a block's own elements.** Need more rows, cards, items, or sections than ship by default? Repeat the block's **existing** element by mapping real data through the same markup - never invent parallel markup that drifts from its design. Need a variant (empty / loading / expanded)? Derive it from an element the block already has.
## Don't invent (read, don't guess)
- Never write a prop, variant value, import path, or `@reui/...` name you didn't read in a component's inline `api`, an installed example, or a `search` result. If you didn't see it, treat it as nonexistent - call `get_component` / `get_examples` / `search` first, or run the MCP `validate_usage` tool to check planned names + props against the docs before writing code.
- If a getter returns `found: false` or `search` returns nothing, say so and fall back (plain shadcn, or ask) - never fabricate an install command or an API.
## What to change vs leave alone
- **Change:** the item's own data, copy, props, and layout to fit the app.
- **Leave alone:** installed component files, hooks, and the shared theme - do not edit vendored ReUI internals; change behavior through props and the documented API.
- Blocks are **portable React** - no `next/link`, `next/image`, or other framework-runtime imports inside them. Keep them portable.
## Demo data -> real data
- Replace every placeholder with the user's real data. Model it as **typed data structures** and **map over arrays** - never duplicate JSX per row/card. Keep small block-specific formatters next to the data.
- Wire the real source (columns, fields, fetch). For `data-grid`, implement the server fetch contract if the user needs server-side data.
- **Type from the component API, derive during render.** Type domain state through the component's own types - e.g. map status to `BadgeProps["variant"]` via a typed `Record<Status, …>` - instead of stringly-typed values. Compute view state during render; don't mirror derived data into `useState`/`useEffect`.
- **Adapt on the right base.** Use the API for the project's base (Base UI vs Radix - see [components.md](./components.md)); the installed files are already base-correct, so reuse their shape rather than translating from memory.
## Believable content (no AI tells)
- Use realistic labels, counts, timestamps, and statuses that map to a real workflow.
- No decorative buttons, fake tabs, meaningless toggles, equal-weight card walls, empty gradients, ornamental icons, or generic SaaS filler. Every element should do something.
## Operational surfaces (settings / profile / admin)
Pick ONE archetype and keep the family consistent: a vertical rail (3-6 sections), horizontal tabs (5-8), or a frame/stack. Prefer `frame` for tool-like surfaces, a card for profile-like ones. Don't mix archetypes in one surface.
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# CLI: registry setup, license, non-interactive install
## Registry setup (one-time, per project)
Free items (the 17 components and all `c-*` examples) need only the plain string registry in `components.json`:
```json
{ "registries": { "@reui": "https://reui.io/r/{style}/{name}.json" } }
```
Premium items (blocks; Motion Icons and templates) require a ReUI license at install:
1. Add the key to `.env.local`:
```bash
REUI_LICENSE_KEY=your-license-key
```
2. Switch `components.json` to the authenticated object form:
```json
{
"registries": {
"@reui": {
"url": "https://reui.io/r/{style}/{name}.json",
"headers": { "Authorization": "Bearer ${REUI_LICENSE_KEY}" }
}
}
}
```
The shadcn CLI expands `${REUI_LICENSE_KEY}` from `.env.local` inside `components.json`, but an MCP client config never expands variables, so a ReUI MCP server config must carry the raw token instead (for example `reui_pat_your_token_here`).
The MCP `get_project_context` tool returns the right config. Full guide: https://reui.io/docs/registry
## Installing
Use the project's package runner (check `packageManager`):
```bash
npx shadcn@latest add @reui/<name> --yes # npm
pnpm dlx shadcn@latest add @reui/<name> --yes # pnpm
bunx --bun shadcn@latest add @reui/<name> --yes # bun
```
`--yes` skips confirmation prompts. The CLI auto-detects the package manager from the lockfile (there is no `--package-manager` flag). It also resolves the correct base+style variant from `components.json`, so do not pass a style.
## Handling prompts and conflicts
- **Always pass `--yes`** so the CLI does not block on confirmation prompts.
- **Do NOT pass `--overwrite` by default.** If the CLI reports an existing file, read the output and resolve deliberately: install under a different name, adjust the path, or ask the user. Only use `--overwrite` when the user explicitly wants to replace a file.
- **Preview first when touching an existing project**: `npx shadcn@latest add @reui/<name> --dry-run` shows what would change; `--diff <file>` shows a specific file's diff. Use these before overwriting.
- Run from the **project root** so `components.json` and `.env.local` are found.
## Free vs premium boundary
- Public, no key: `c-*` examples and the 17 components (`@reui/data-grid`, `@reui/badge`, ...) that those examples depend on.
- Key required at install: blocks (`@reui/<category>-N`) need a Pro or Ultimate license; Motion Icons (`@reui/icons/...`) and templates need Ultimate.
If an install 401/403s, the license key is missing, invalid, or the plan does not cover that resource (blocks: Pro or higher; icons and templates: Ultimate). Point the user to https://reui.io/account (their key) or https://reui.io/pricing (upgrade).
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# ReUI components
The 19 ReUI building blocks: `alert`, `autocomplete`, `badge`, `data-grid`, `date-selector`, `event-calendar`, `filters`, `frame`, `gantt`, `icon-stack`, `kanban`, `number-field`, `phone-input`, `rating`, `scrollspy`, `sortable`, `stepper`, `timeline`, `tree`. Examples and blocks are composed from these.
**Rule one: never guess a component's API. Read it first.** Call **`get_component(name)`** for its inline `api` (props + usage, no web fetch), and **share the result's `docsUrl`** (the component's API documentation page) with the user whenever you work with that component's API, so they have the full reference (the `/llms.txt` index is a further fallback). Then call **`get_examples(name)`** to install a worked example and copy real composition. The contracts below are first-try orientation (required props, composition shape, the one gotcha); the inline `api` is the full reference. No single block fits? Compose: search the components you need, read each `get_component`, install a `get_examples` example per component, and adapt.
## data-grid (the flagship - read its API every time)
`data-grid` wraps TanStack Table v8. It is NOT a styled `<table>` and does NOT take `data`/`columns` props directly. The contract:
- Build a TanStack table instance with `useReactTable(...)` (columns, data, the feature models you need: sorting, pagination, row selection).
- Pass that instance to `<DataGrid table={table} recordCount={total}>`.
- Compose the body with `DataGridTable` inside `DataGrid`, and enable features through `tableLayout` (e.g. `{ headerSticky: true, columnsResizable: true }`), not ad-hoc classes.
- Server-side data uses the documented fetch shape (`recordCount` is the total for pagination).
```tsx
const table = useReactTable({
data,
columns,
getCoreRowModel: getCoreRowModel(),
// add sorting/pagination/selection models per the API
})
<DataGrid table={table} recordCount={data.length}>
<DataGridTable />
</DataGrid>
```
Common mistakes:
- **Incorrect:** `<DataGrid data={rows} columns={cols} />` - these props do not exist. **Correct:** build a `useReactTable` instance and pass `table={table}` + `recordCount`.
- **Incorrect:** a raw `<table>` / hand-rolled pagination. **Correct:** use `data-grid`; read its API for sticky header, pagination, virtualization, row selection.
- **Incorrect:** styling rows/cells with arbitrary classes. **Correct:** drive layout via `tableLayout` and the documented `ColumnMeta` (e.g. `cellClassName`, `headerTitle`).
## event-calendar
**Required:** events via `events`/`onEventsChange` (controlled) or `defaultEvents` (uncontrolled), plus a height on the root.
**Shape:**
```tsx
<EventCalendar defaultEvents={events} defaultView="month" className="h-[560px]">
<EventCalendarNav />
<EventCalendarContent />
</EventCalendar>
```
**Gotcha:** headless-first: `EventCalendarContent` renders the active view (month/week/day/days/agenda; a resource view activates when `resources` is passed) - there is no per-view JSX to compose. Events are `{ id, title, start, end (exclusive), allDay?, color?, recurrence?, resourceId? }`. Mutations flow through `onEventUpdate`/`canDropEvent` (return `false` to reject); the root needs an explicit height because it is a min-h-0 flex column.
## gantt
**Required:** `resources` (the left tree) plus bars via `events`/`defaultEvents` attached by `resourceId`.
**Shape:**
```tsx
<Gantt defaultEvents={bars} resources={tasks} defaultScale="month" className="h-[480px]">
<GanttNav />
<GanttView />
</Gantt>
```
**Gotcha:** bars move along the time axis only (never across rows) and are all-day spans with exclusive `end`; `progress` is 0-100. Scales are `day | week | month | quarter | year`. Zoom control, infinite scroll, summary rollups, and row checkboxes are ON by default - turn off what you do not need. Same `onEventUpdate`/`canDropEvent` commit pipeline as `event-calendar`; the root needs an explicit height.
## kanban
**Required:** `value` (`Record<string, T[]>`), `onValueChange`, `getItemValue`
**Shape:**
```tsx
<Kanban value={cols} onValueChange={setCols} getItemValue={(i) => i.id}>
<KanbanBoard>
{Object.entries(cols).map(([id, items]) => (
<KanbanColumn key={id} value={id}>
<KanbanColumnHandle><h3>{id}</h3></KanbanColumnHandle>
<KanbanColumnContent value={id}>
{items.map((i) => (
<KanbanItem key={i.id} value={i.id}>
<KanbanItemHandle>{i.title}</KanbanItemHandle>
</KanbanItem>
))}
</KanbanColumnContent>
</KanbanColumn>
))}
</KanbanBoard>
<KanbanOverlay><div className="bg-muted size-full rounded-md" /></KanbanOverlay>
</Kanban>
```
**Gotcha:** state is `Record<columnId, T[]>`. Each `KanbanColumnContent value` must match its parent `KanbanColumn value`. Omit `KanbanOverlay` and the drag preview silently breaks.
## sortable
**Required:** `value` (`T[]`), `onValueChange`, `getItemValue`
**Shape:**
```tsx
<Sortable value={items} onValueChange={setItems} getItemValue={(i) => i.id}>
{items.map((i) => (
<SortableItem key={i.id} value={i.id}>
<SortableItemHandle><GripVertical /></SortableItemHandle>
{i.label}
</SortableItem>
))}
</Sortable>
```
**Gotcha:** a flat 1D reorder list (not columns - that is `kanban`). `getItemValue` must return a stable, unique string. Pass `layout="grid"` or `layout="nested"` for non-list layouts.
## filters
**Required:** `filters` (`Filter[]`), `fields` (`FilterFieldConfig[]`), `onChange`
**Shape:**
```tsx
const [filters, setFilters] = useState<Filter[]>([
createFilter("priority", "is_any_of", ["low"]),
])
const fields: FilterFieldConfig[] = [
{ key: "priority", label: "Priority", type: "multiselect",
options: [{ value: "low", label: "Low" }, { value: "high", label: "High" }] },
]
<Filters filters={filters} fields={fields} onChange={setFilters} />
```
**Gotcha:** always build initial filters with `createFilter(field, operator, values)` - it generates the required `id`. Never hand-construct a `Filter` object. Pairs naturally with `data-grid`.
## date-selector
**Required:** none, but wire `onChange` to capture the value.
**Shape:**
```tsx
const [value, setValue] = useState<DateSelectorValue | undefined>()
<DateSelector value={value} onChange={setValue} label="Due date" />
```
**Gotcha:** the value is a structured `DateSelectorValue` (period / operator / start+end dates), NOT a `Date` - never pass a raw `Date`. Use `allowRange={false}` to lock single-date picking. Read `get_component("date-selector")` for the value shape.
## tree
**Required:** `tree` (a `@headless-tree/core` instance you construct)
**Shape:**
```tsx
<Tree tree={tree}>
{tree.getItems().map((item) => (
<TreeItem key={item.getId()} item={item}>
<TreeItemLabel />
</TreeItem>
))}
</Tree>
```
**Gotcha:** `Tree` is a styled shell - it takes a headless-tree instance via `tree`, NOT `data`/`items` props. Build the instance with `@headless-tree/react`. External API: https://headless-tree.lukasbach.com/
## stepper
**Required:** `StepperItem step` (number), `StepperContent value` (number)
**Shape:**
```tsx
<Stepper defaultValue={1}>
<StepperNav>
<StepperItem step={1}>
<StepperTrigger><StepperIndicator>1</StepperIndicator></StepperTrigger>
<StepperSeparator />
</StepperItem>
<StepperItem step={2}>
<StepperTrigger><StepperIndicator>2</StepperIndicator></StepperTrigger>
</StepperItem>
</StepperNav>
<StepperPanel>
<StepperContent value={1}>Step 1 content</StepperContent>
<StepperContent value={2}>Step 2 content</StepperContent>
</StepperPanel>
</Stepper>
```
**Gotcha:** steps are 1-indexed. Without `StepperPanel` + `StepperContent` you render the nav trail but no body. Put `StepperSeparator` in every `StepperItem` except the last.
## timeline
**Required:** `TimelineItem step` (number)
**Shape:**
```tsx
<Timeline>
<TimelineItem step={1}>
<TimelineHeader>
<TimelineDate>March 2024</TimelineDate>
<TimelineTitle>Project initialized</TimelineTitle>
</TimelineHeader>
<TimelineIndicator />
<TimelineSeparator />
<TimelineContent>Repo and architecture set up.</TimelineContent>
</TimelineItem>
</Timeline>
```
**Gotcha:** each item needs a unique `step`. `orientation` is `"vertical"` (default) or `"horizontal"`. This is a static event display, not interactive like `stepper`.
## autocomplete
**Required:** `items` (array; each item has at least `value`)
**Shape:**
```tsx
<Autocomplete items={items}>
<AutocompleteInput placeholder="Search..." />
<AutocompleteContent>
<AutocompleteEmpty>No results found.</AutocompleteEmpty>
<AutocompleteList>
{(item) => (
<AutocompleteItem key={item.value} value={item}>{item.label}</AutocompleteItem>
)}
</AutocompleteList>
</AutocompleteContent>
</Autocomplete>
```
**Gotcha:** `AutocompleteList` takes a render-prop `(item) => ReactNode`, NOT a mapped array of children. External API: https://base-ui.com/react/components/autocomplete
## phone-input
**Required:** none, but wire `onChange`.
**Shape:**
```tsx
<PhoneInput placeholder="Enter phone number" defaultCountry="US" value={value} onChange={setValue} />
```
**Gotcha:** `value`/`onChange` use an E.164 string (e.g. `"+14155551234"`), not a display-formatted string; `onChange` can fire `undefined`. `defaultCountry` is a 2-letter ISO code. Wraps `react-phone-number-input`.
## number-field
**Required:** wrap the controls in `NumberFieldGroup`.
**Shape:**
```tsx
<NumberField defaultValue={0}>
<NumberFieldScrubArea label="Quantity" />
<NumberFieldGroup>
<NumberFieldDecrement />
<NumberFieldInput />
<NumberFieldIncrement />
</NumberFieldGroup>
</NumberField>
```
**Gotcha:** import from `@/components/ui/number-field`. The accessible label goes on `NumberFieldScrubArea`, not `NumberField`. External API: https://base-ui.com/react/components/number-field
## rating
**Required:** `rating` (number)
**Shape:**
```tsx
<Rating rating={4.5} showValue editable onRatingChange={setRating} />
```
**Gotcha:** supports decimals (partial stars). Pass `editable` + `onRatingChange` for interactive input; omit both for a read-only display.
## scrollspy
**Required:** `targetRef` (the scroll container ref)
**Shape:**
```tsx
<Scrollspy targetRef={containerRef}>
<a href="#s1" data-scrollspy-anchor="s1">Section 1</a>
<a href="#s2" data-scrollspy-anchor="s2">Section 2</a>
</Scrollspy>
<div ref={containerRef}>
<div id="s1">...</div>
<div id="s2">...</div>
</div>
```
**Gotcha:** each link's `data-scrollspy-anchor` must match a section `id`. `targetRef` is the scrollable container (defaults to the window).
## frame
**Required:** `Frame` > `FramePanel`
**Shape:**
```tsx
<Frame>
<FramePanel>
<FrameHeader>
<FrameTitle>Title</FrameTitle>
<FrameDescription>Description</FrameDescription>
</FrameHeader>
<div className="p-5">Content</div>
<FrameFooter>Footer</FrameFooter>
</FramePanel>
</Frame>
```
**Gotcha:** a structured card shell for tool-like surfaces. `stacked` connects multiple panels with shared borders; `dense` removes panel padding; radius via the `--frame-radius` CSS variable.
## icon-stack
**Required:** one child icon
**Shape:**
```tsx
<IconStack aria-hidden="true">
<InboxIcon className="size-4" />
</IconStack>
```
**Gotcha:** isometric layered artwork for empty states and illustrations; style the inner icon via its own `className`. Mark purely decorative stacks `aria-hidden="true"` and keep the real label in surrounding copy.
## alert
**Required:** `Alert` > `AlertTitle`
**Shape:**
```tsx
<Alert variant="success">
<ShieldCheckIcon />
<AlertTitle>Security update</AlertTitle>
<AlertDescription>Enable two-factor authentication.</AlertDescription>
<AlertAction><Button size="xs">Update</Button></AlertAction>
</Alert>
```
**Gotcha:** shadcn-compatible API. `variant`: `default | destructive | info | success | warning | invert`. The non-default variants use ReUI extended color tokens (`--success`/`--info`/`--warning`/`--invert`), which the install adds. Defer generic alert rules to the shadcn skill.
## badge
**Required:** none (text child).
**Shape:**
```tsx
<Badge variant="success-light" size="sm">Success</Badge>
<Badge variant="outline" radius="full">Pill</Badge>
```
**Gotcha:** shadcn-compatible. Rich `variant` set (solid, `-outline`, `-light` per color), `size` `xs..xl`, `radius` `default | full`. Like `alert`, the color variants rely on ReUI extended tokens. Prefer `Badge` variants over raw color classes for statuses.
## base vs radix - write for the project's base
ReUI ships every component in two builds: `base` (Base UI) and `radix` (Radix UI). The install command and name are identical, and the CLI installs the build matching the project. But you must write/adapt code against the **right base**, because their APIs differ.
**Detect the base first.** Read `components.json` -> `style` and take the segment before the first `-`:
- `"style": "base-nova"` -> **Base UI**
- `"style": "radix-nova"` -> **Radix UI**
**Then use that base's API.** The deltas mirror shadcn's base-vs-radix split:
- Slot/composition: Base UI `render={<… />}` vs Radix `asChild`.
- `Select`: Base UI takes `items`; Radix uses `<SelectItem>` children.
- `ToggleGroup`: Base UI `multiple` boolean vs Radix `type="single" | "multiple"`.
The safest path is to **read the installed files and `c-*` examples** - they're already in your base, so reuse their wiring instead of guessing. When `get_component`'s inline `api` or an example shows the other base's shape, translate it to your base (or `validate_usage` to confirm). Defer the generic base/radix mechanics to the shadcn skill.
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# Craft: make ReUI UI exceptional, not generic
ReUI items ship senior-designer quality. Your adaptation has to hold that bar, so the result reads like a real product surface a team would keep - not a wireframe an AI generated. Use these alongside the reuse rules in [adapting.md](./adapting.md).
## Have a point of view
Pick an emotional register before you compose - calm, operational, premium, editorial, dense, energetic - and let layout, spacing, surface treatment, and icon behavior all reinforce it. One or two memorable decisions and restraint everywhere else beats ten generic ones. UI with no point of view reads as generated.
## Brutally clear hierarchy
One focal point per card or panel: the dominant metric or task first, its label second, supporting detail third. The first thing the eye lands on should be the right thing; secondary text must read as secondary. Borders, separators, and surfaces do real work to create 2-3 information bands - don't flatten everything to equal weight.
## Spacing rhythm and deliberate density
Gaps are a signal, not a default. Keep them intentional and consistent within a family (`gap-1`/`gap-2` for tight operational rows, larger gaps for section breaks), and smaller within a group than between groups. Match the surrounding ReUI density; don't pad an operational surface like a marketing page, and don't drift density mid-section. The composition should still feel authored in grayscale.
## Cover the real states (the usual miss)
A surface isn't done at the happy path. Compose, and wire:
- **Empty** - a purposeful empty state (short message + the primary action), never a blank panel.
- **Loading** - a **skeleton** that matches the real layout, not a centered spinner.
- **Error** - an inline, recoverable error with a retry, announced via `role="status"`/`aria-live`.
Derive these from an element the block already has (don't invent parallel markup), or `get_examples` for a state-specific example.
## Responsive by default
Mobile-first, not mobile-afterthought. In constrained rows/cards/sidebars, put `min-w-0` on the shrinking container and `truncate` long single-line labels; protect the primary label's width and let secondary content compress. Reflow layouts (multi-column -> single column) rather than just shrinking them. Desktop and mobile should both look designed.
## Motion, subtly
Motion should clarify, not decorate. Use ReUI Motion Icons on primary actions for a subtle hover cue; keep transitions short (~200-300ms) with calm easing; prefer a skeleton pulse over a spinner. No bouncing, no gratuitous entrance animations on every element.
## Real, activated content
Use believable, typed data (realistic labels, counts, timestamps, statuses that map to a real workflow) - never lorem or abstract filler. Every visible control does something: no decorative buttons, fake tabs, meaningless toggles, or stats with no job. It must still hold with long names, empty values, and crowded data.
## Avoid the AI tells
These instantly read as generated - don't ship them: equal-weight card walls, empty gradients, repetitive padding everywhere, generic enterprise copy, ornamental icons, and number tiles that don't earn their place.
## The bar
Before you finish, ask: **would a product team keep this instead of replacing it? Does it still feel strong after swapping in real content?** If not, reuse the shipped ReUI design harder - don't restyle it into something new - then run the [quality.md](./quality.md) gates.
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# Icons (ReUI delta over shadcn)
Follow the shadcn icon rules (use the project's configured `iconLibrary`, `data-icon` on icons inside `Button`, no sizing classes on icons inside components, pass icons as component objects not string keys). ReUI adds the following.
## Portable icons (library-agnostic)
ReUI components, examples, and blocks are authored to be icon-library-agnostic. When `iconLibrary` is set in `components.json`, the shadcn CLI installs each item's icons in **your** library automatically - you swap nothing. If an installed item's icons don't match your project (for example `iconLibrary` isn't set, so they came in from the item's demo library), change the **import source and component name** to your library, keeping the same icon-name semantics:
- `lucide` -> `lucide-react`
- `tabler` -> `@tabler/icons-react`
- `phosphor` -> `@phosphor-icons/react`
- `remix` -> `@remixicon/react`
- `hugeicons` -> `@hugeicons/react`
Don't assume `lucide-react`; read `iconLibrary` from `components.json`.
## Keep icons purposeful
Icons support the hierarchy, they don't replace it: keep them small, matched to the surrounding density, and decorative ones `aria-hidden="true"` (an icon-only control still needs an accessible label on the control). Don't add ornamental icons that do no job.
## Motion Icons (the `@reui/icons/...` set)
ReUI ships its own icon set in 4 styles (outline, solid, duotone, filled), each icon in two variants:
```bash
npx shadcn@latest add @reui/icons/default/<style>/<name> --yes # static
npx shadcn@latest add @reui/icons/animated/<style>/<name> --yes # hover-animated (motion/react)
```
Finding them via the MCP is free; installing requires an Ultimate license (`REUI_LICENSE_KEY`, see [cli.md](./cli.md)). Reach for a Motion Icon on a primary action when a subtle hover cue helps; keep motion restrained.
Finding icons:
- Several icons (the common case): **`search_icons(concepts[])`** - up to 24 concepts in one call, the best icons per concept with install commands. Pass `animated: true` to get only icons with a hover-animated Motion variant.
- One icon: `search` with `type: "icon"`.
- Icon results and `get_icon` carry `animated: true` and `installAnimated` when an animated variant exists - use those install strings, do not construct paths by hand.
- Every icon result carries a `previewUrl` (its live icon-category page) - **share it with the user** so they can SEE the icon before installing.
The `icon-stack` component composes multiple icons into a stacked display.
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# Quality gates (security, accessibility, scroll)
These are the **done gate**, not a nice-to-have: before you call any ReUI work finished, call the MCP `get_audit_checklist` tool and pass every item below (plus the craft bar in [craft.md](./craft.md)). Then typecheck and lint.
## Security
- Never `dangerouslySetInnerHTML`. Render data as text/components.
- External links (`target="_blank"`) must always pair `rel="noopener noreferrer"`.
- No real PII, secrets, or tokens in demo or committed code. Remote media only from sources the project already allows.
## Accessibility
- Implicit list/card items that navigate get real anchors with a standard hover affordance.
- Icon-only or numeric buttons need an `aria-label`; decorative icons get `aria-hidden`.
- Every non-submit button is `type="button"`.
- Keyboard + focus: everything interactive is reachable in a sensible Tab order with a visible focus ring; layers (dialogs/sheets/menus) trap focus and close on `Escape`. ReUI components ship standard keyboard behavior - read each component's inline `api` rather than re-implementing it.
- Announce async UI: loading and error messages use `role="status"` / `aria-live` so they're not silent to screen readers.
## Scroll mechanics
- Make scroll regions with a parent-owned height: a `min-h-0` + flex chain down to the scroll container. Never guess a `max-h`.
- The scroll container owns `overflow-auto`; ancestors stay `min-h-0` so the height resolves.
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# ReUI registry structure
ReUI is a shadcn-compatible registry with four entity types. **Examples and blocks are built FROM components** - reuse them, don't rebuild.
- **component** - one of the 17 ReUI building blocks with a real API (`data-grid`, `kanban`, `filters`, `date-selector`, `tree`, ...). Install directly (`@reui/data-grid`) or let it come in as a dependency of an example/block. Free. Read its API with `get_component(name)`.
- **example** - a free `c-*` single-pattern use-case of a component (`c-kanban-1`, `c-data-grid-3`). Install one and read it to copy real composition. Find a component's examples with `get_examples(name)`.
- **block** - a premium, full-page section that composes several components (`data-grid-2`, `pricing-page-1`). Pro or Ultimate license at install. Adapts to your active theme via semantic tokens.
- **icon** - Motion Icons in 4 styles (outline, solid, duotone, filled), static (`@reui/icons/default/<style>/<name>`) and hover-animated (`@reui/icons/animated/<style>/<name>`). Ultimate license at install. See [icons.md](./icons.md).
## The @reui registry
Install everything through the shadcn CLI: `npx shadcn@latest add @reui/<name> --yes`. The CLI reads the `@reui` registry from the project's `components.json`. Free items need only the plain string form:
```json
{ "registries": { "@reui": "https://reui.io/r/{style}/{name}.json" } }
```
Premium installs need the authenticated form + `REUI_LICENSE_KEY` in `.env.local` - see [cli.md](./cli.md). The MCP `get_project_context` tool returns the right config.
## Know your base: base or radix
ReUI ships every item in two builds - `base` (Base UI) and `radix` (Radix UI) - with mirrored names. The CLI installs the build matching your project automatically, but **you must write code against the right base's API**. Detect it from `components.json` -> `style`: the segment before the first `-` is the base (`base-nova` -> Base UI, `radix-nova` -> Radix UI). The installed files and `c-*` examples are already in your base - read them and adapt on that base. See [components.md](./components.md) for the API deltas.
**So the MCP's own `docsUrl` and `previewUrl` match your base**, send your `style` to the MCP: add `?style=<your components.json style>` to the ReUI MCP server URL (or set an `X-Reui-Style` header) in your MCP client config - set once, applies to every call. The MCP then resolves docs/preview links to YOUR library (`/docs/components/radix/...`, `/preview/radix/...` for a radix project) instead of the default base; `get_project_context` echoes back the style it currently sees so you can confirm it. Install commands are unaffected (the CLI already installs the right variant). If you notice the MCP returning `base` links for a `radix` project, tell the user to add `?style=` to the server URL.
Blocks adapt to your active theme through semantic tokens and CSS variables - change the theme and every block follows.
## Free vs premium
- **Free, no key:** the 17 components, all `c-*` examples, the ReUI MCP, and this skill.
- **Premium, license required at install:** blocks (Pro or Ultimate), Motion Icons and templates (Ultimate). Set `REUI_LICENSE_KEY` (see [cli.md](./cli.md)).
## Component API index
The canonical index of every component's API docs is **https://reui.io/llms.txt** (returned as `componentsApiUrl` in MCP results). Prefer the inline `api` from `get_component`; use the index/docs as the fallback.
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# Styling (ReUI delta over shadcn)
Follow the shadcn skill for the generic rules (semantic colors not raw values, `gap-*` not `space-y-*`, `size-*`, `cn()`, no manual `dark:` overrides, no overlay `z-index`). This file is only the ReUI-specific additions.
## ReUI extended semantic tokens
ReUI adds semantic tokens beyond shadcn's base set. Use these instead of raw colors for status and emphasis:
- `--success` / `--success-foreground`
- `--info` / `--info-foreground`
- `--warning` / `--warning-foreground`
- `--destructive-foreground` (paired with shadcn's `--destructive`)
- `--invert` / `--invert-foreground` (inverted surfaces)
Use them as Tailwind utilities (`bg-success text-success-foreground`, `text-warning`, ...). They are defined in the project's global CSS and registered with Tailwind (`@theme inline` on v4). If a token is missing in the project, add it to the global CSS file (never a new file) following the same `name` / `name-foreground` convention, exactly as the shadcn customization rules describe.
**Incorrect:** `<span className="text-green-600">Active</span>`
**Correct:** `<Badge variant="success">Active</Badge>` or `<span className="text-success">Active</span>`
## Blocks follow your theme
When you install a block it adapts to your active theme through the semantic tokens above and the project's CSS variables. Don't hardcode style-specific values into installed block code and don't fork it to "restyle" - change the theme via the CSS variables / a preset and every block follows. Want a different look? `search` for a block whose design already fits instead of re-skinning one.
## Density and typography rhythm
ReUI operational UI usually feels dense, not airy. Keep the gap between a title and its supporting description tight by default (`gap-0.5`, `space-y-1`, or `space-y-px`), and smaller than the gap between sections. Match the surrounding ReUI density when you add rows or fields; do not pad operational surfaces like a marketing page.
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# Workflow: find -> install -> read API -> adapt
The core ReUI loop. The MCP tells you what to install and gives you the API; the shadcn CLI installs it; you turn the installed files into correct, themed, data-wired code by **reuse**, not redesign.
## 1. Find (ReUI MCP `search` / `compose_page`)
**Full multi-section page ask?** Call `compose_page(intent, sections?)` FIRST, before searching block-by-block. It returns ordered sections, each with the best block for the intent (top pick + alternates); sections listed in `unavailableSections` have no real inventory - compose those from components, do not force a bad block.
For everything else, call `search` with the user's intent. Pass structured hints whenever you can infer them - you are an LLM, so do the parsing the server cannot:
- `type`: `"component"` (one of the 17 building blocks), `"example"` (a c-\* use-case), `"block"` (a full page/section), `"icon"`.
- `component`: the ReUI component the request implies (`"data-grid"`, `"kanban"`, ...).
- `category`, `features` (e.g. `["sortable","pagination"]`), `free`.
Example: "build a users management page with filters" -> `search({ query: "users management page with filters", type: "block", component: "data-grid", features: ["filters"] })`.
Each result has `install`, `previewUrl`, `docsUrl`, `componentsUsed`, `score`, `termCoverage`, and `whyMatch`. `score` is relative to the top hit (the top is ~100 by construction), not an absolute quality - compare results to each other, and show the user the top options if several score closely; do not silently guess. A low `termCoverage` means a weak match even with a high score - rephrase or widen.
**Always show the preview link.** Whenever you list or recommend items - from `search`, `search_icons`, `list_components`, `compose_page`, or a getter - include each item's `previewUrl` (a live preview page) so the user can SEE it before you install. Blocks and examples link to an individual live preview; icons and components to their live category/component page. This applies to every listing, not only a single pick.
## 2. Install (shadcn CLI)
Run the result's `install` command from the project root, non-interactively:
```bash
npx shadcn@latest add @reui/<name> --yes
```
The CLI reads `components.json`, installs the correct base+style variant, resolves `registryDependencies` (a block pulls in its components), installs npm deps, and rewrites aliases. Do not pass the base/style. See [cli.md](./cli.md).
## 3. Read the API (do not guess props)
Before writing code against any component an item uses:
1. The item's `componentDigests` already give a 1-line contract per component - often enough to wire it. For the full API, call **`get_component(names)`** with ALL of `componentsUsed` in ONE call (it accepts an array) and read each inline `api` - no web fetch. **Share the component's `docsUrl`** (its API documentation page) with the user whenever you work with that component's API, so they have the full reference; the `/llms.txt` index is a further fallback.
2. Call **`get_examples(name)`** for the free `c-*` examples of that component; install one and **read the added files** to copy the exact composition. This is the fastest correct path - the example shows real wiring you adapt, not invent.
3. About to write a prop you did not see in an `api` or installed file? Run **`validate_usage`** BEFORE writing the code - per-prop documented / notDocumented verdicts plus did-you-mean suggestions. notDocumented means read the API, not push on.
## 4. Adapt (reuse-first) - do not skip
Installing files is not the end, and redesigning them defeats the point. First note the project's **base** so you write the right API - read `components.json` -> `style` and take the segment before the first `-` (`base-nova` -> Base UI, `radix-nova` -> Radix UI), see [components.md](./components.md). After `add`:
1. **Read the added files**; keep the composition intact. For a block, verify the components are wired correctly (for `data-grid`: a `useReactTable` instance passed as `table`, `recordCount` set - see [components.md](./components.md)).
2. **Replace demo data with the user's real data** via typed structures (see [adapting.md](./adapting.md)).
3. **Fix icon imports** to the project's icon library (see [icons.md](./icons.md)).
4. **Align styling** to semantic tokens and the active theme - no raw colors (see [styling.md](./styling.md)).
5. **Validate before finalizing**: if your adaptation introduced components or props you did not read in an `api` or example, run `validate_usage` on them.
6. **Hit the craft bar** - clear hierarchy, deliberate density, the empty / loading / error states, subtle motion, and mobile-first responsiveness (see [craft.md](./craft.md)). Generic-looking output means you under-reused the design, not that it needs restyling.
7. **Pass the quality gates** (security, a11y, scroll) - call the MCP `get_audit_checklist` tool and clear every item (see [quality.md](./quality.md)).
8. **Typecheck / lint**.
## If no single block fits
Compose from components (`compose_page` tells you which sections have no block inventory via `unavailableSections`). `search` the components you need, read each `get_component` API, install a worked `get_examples` example for each, and assemble by adapting those examples. A block in the same category is a useful reference - install it and read its files to see how ReUI composes those components, then adapt.
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# ReUI MCP: full reference
The ReUI MCP (`https://mcp.reui.io`, Streamable HTTP) is free to use but needs a ReUI account: on first use the agent signs in with ReUI (a free account is created if the user has none), so every request is tied to an account. Free covers components and examples; a Pro or Ultimate license unlocks premium blocks and Motion Icons and removes the daily request limit. It does **discovery + guidance** (search, inline APIs, page planning, validation) and never serves source; the shadcn CLI does **installation**, and the license key lives there (the `@reui` entry in `components.json`, backed by `.env.local`). Goal: from the user's intent to correct, themed, data-wired ReUI code in the **fewest tokens and calls**, with **no guessing**.
## Golden path (token-optimal - follow this order)
Most tasks need 2-4 MCP calls and ZERO web fetches:
1. **`search(query, ...hints)`** -> pick the top 1-3 results. Each result already carries `install`, `previewUrl`, `docsUrl`, `componentsUsed`, `score`, `whyMatch`. The payload is complete - do not call another tool just to "confirm" a result.
2. **`get_component([...componentsUsed])`** in ONE batched call (one name or an array of up to 20) -> read each inline `api`. This **replaces** fetching docs pages. Often skippable: search responses carry `componentDigests`, a compact API contract per referenced component.
3. **`get_examples(component)`** -> install ONE returned `c-*` example, read the added files, copy the composition.
4. **`get_install_command(item)`** only to validate a name you are unsure of (results already include `install`). Run the install with the shadcn CLI (`--yes`).
5. **`get_audit_checklist()`** before declaring done.
If you already know the exact item name, skip `search`. Everything else is situational.
## The 5 task-specific tools (when to reach for each)
- **`compose_page`** - BEFORE building any full page (dashboard, settings, billing, landing). Pass the intent (and optionally the sections you want); it returns ordered sections, each with the best premium block for the intent (top pick + alternates). Sections with no real inventory are listed honestly in `unavailableSections` - compose those from components instead of forcing a bad block.
- **`search_icons`** - whenever you need icons, especially several. Batch up to 24 concepts in one call; each concept returns its best icons with install commands. Pass `animated: true` to get only icons that have a hover-animated Motion variant.
- **`validate_usage`** - BEFORE writing code with component names or props you have not read in an inline `api` or an installed example. It checks planned names + props against the indexed API docs and registry item names; returns did-you-mean suggestions and per-prop documented / notDocumented verdicts. Deterministic, no inference - a notDocumented prop means stop and read the API, not push on.
- **`whats_new`** - when your registry knowledge might be stale (a name 404s, the user mentions an item you don't know). Returns items added/removed per build, newest first.
- **`report_issue`** - when an installed item is actually broken (bad source, wrong dependency, broken preview). Goes straight to the ReUI team; rate-limited 5/hour. Not for usage questions.
## All 19 tools
`search`, `get_block`, `get_example`, `get_icon`, `list_block_groups`, `list_block_categories`, `list_example_categories`, `list_icon_categories`, `list_components`, `get_component`, `get_examples`, `search_icons`, `compose_page`, `validate_usage`, `whats_new`, `report_issue`, `get_install_command`, `get_project_context`, `get_audit_checklist`. The MCP serves the full parameter schemas; do not guess parameters beyond them.
## Token + speed rules
- **Batch `get_component`** - ONE call with the whole `componentsUsed` array, never N calls. Skip it entirely when `componentDigests` already answers the question.
- **Read source by installing** - the MCP serves no source. To read or analyze an item's real code, install it with the shadcn CLI and open the local files. Learn an API from the inline `api` / `componentDigests`, never by reading raw source.
- **Infer `search` hints yourself** (`type`, `component`, `category`, `features`, `free`) - hints shrink the result set and the tokens. Keep `limit` low; one right result beats ten.
- Run independent calls (and the shadcn install) concurrently in one turn - serial tool calls are the main source of slowness.
- Don't repeat a search for the same intent; don't call `list_*` to "see everything" - `search` is the entry point, `list_*` is only for browsing a taxonomy the user explicitly wants to explore.
- Prefer `get_component`'s inline `api` over `docsUrl` / `/llms.txt`. Fetch a web page only as a last resort.
## Result shapes (so you don't re-fetch)
- `score` is 0-100 RELATIVE to the top hit (the top is ~100 by construction), not absolute - compare results to each other.
- `termCoverage` (0-1) is the share of the query the item matched - low means a weak match even if the score looks high; rephrase or widen the search.
- Each result carries `whyMatch`, `install`, docs/preview URLs, and a `free` flag; premium items carry `requiredPlan` (`"pro"` for blocks, `"ultimate"` for icons).
- `componentDigests` is a top-level map: a compact API contract per referenced component - often enough to wire an item without a `get_component` call.
- Icon results and `get_icon` include `animated: true` and `installAnimated` when a hover-animated Motion variant exists (animated: `@reui/icons/animated/<style>/<name>`; static: `@reui/icons/default/<style>/<name>`).
## Error playbook
- **401** - the MCP requires a signed-in ReUI account. The client prompts "Sign in with ReUI" (OAuth) on first use; a free account is created if needed. For headless/CI, pass a personal token (`reui_pat_...`, created at https://reui.io/account/mcp) as `Authorization: Bearer`.
- **403 / locked result** - a valid account but the plan does not cover the item: premium blocks need Pro, Motion Icons need Ultimate. Point to https://reui.io/pricing (upgrade). Free accounts still get all components + examples.
- **429** - rate limited (120 requests/min per IP); back off, honor `Retry-After`.
- **not found** (`found: false`) - use the returned `suggestions`, or `search`; check `whats_new` if you suspect a stale name. Never run a fabricated install command.
## Fallbacks
- No ReUI MCP: `npx shadcn@latest search @reui -q "..."` then `add` (generic, no scoring / inline API).
- The shadcn project's own MCP also works over the `@reui` registry: https://ui.shadcn.com/docs/mcp.
Per-agent MCP setup: https://reui.io/docs/mcp
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---
name: shadcn
description: Manages shadcn components and projects — adding, searching, fixing, debugging, styling, and composing UI. Provides project context, component docs, and usage examples. Applies when working with shadcn/ui, component registries, presets, --preset codes, or any project with a components.json file. Also triggers for "shadcn init", "create an app with --preset", or "switch to --preset".
user-invocable: false
allowed-tools: Bash(npx shadcn@latest *), Bash(pnpm dlx shadcn@latest *), Bash(bunx --bun shadcn@latest *)
---
# shadcn/ui
A framework for building ui, components and design systems. Components are added as source code to the user's project via the CLI.
> **IMPORTANT:** Run all CLI commands using the project's package runner: `npx shadcn@latest`, `pnpm dlx shadcn@latest`, or `bunx --bun shadcn@latest` — based on the project's `packageManager`. Examples below use `npx shadcn@latest` but substitute the correct runner for the project.
## Current Project Context
```json
!`npx shadcn@latest info --json`
```
The JSON above contains the project config and installed components. Use `npx shadcn@latest docs <component>` to get documentation and example URLs for any component.
## Principles
1. **Use existing components first.** Use `npx shadcn@latest search` to check registries before writing custom UI. Check community registries too.
2. **Compose, don't reinvent.** Settings page = Tabs + Card + form controls. Dashboard = Sidebar + Card + Chart + Table.
3. **Use built-in variants before custom styles.** `variant="outline"`, `size="sm"`, etc.
4. **Use semantic colors.** `bg-primary`, `text-muted-foreground` — never raw values like `bg-blue-500`.
## Critical Rules
These rules are **always enforced**. Each links to a file with Incorrect/Correct code pairs.
### Styling & Tailwind → [styling.md](./rules/styling.md)
- **`className` for layout, not styling.** Never override component colors or typography.
- **No `space-x-*` or `space-y-*`.** Use `flex` with `gap-*`. For vertical stacks, `flex flex-col gap-*`.
- **Use `size-*` when width and height are equal.** `size-10` not `w-10 h-10`.
- **Use `truncate` shorthand.** Not `overflow-hidden text-ellipsis whitespace-nowrap`.
- **No manual `dark:` color overrides.** Use semantic tokens (`bg-background`, `text-muted-foreground`).
- **Use `cn()` for conditional classes.** Don't write manual template literal ternaries.
- **No manual `z-index` on overlay components.** Dialog, Sheet, Popover, etc. handle their own stacking.
### Forms & Inputs → [forms.md](./rules/forms.md)
- **Forms use `FieldGroup` + `Field`.** Never use raw `div` with `space-y-*` or `grid gap-*` for form layout.
- **`InputGroup` uses `InputGroupInput`/`InputGroupTextarea`.** Never raw `Input`/`Textarea` inside `InputGroup`.
- **Buttons inside inputs use `InputGroup` + `InputGroupAddon`.**
- **Option sets (27 choices) use `ToggleGroup`.** Don't loop `Button` with manual active state.
- **`FieldSet` + `FieldLegend` for grouping related checkboxes/radios.** Don't use a `div` with a heading.
- **Field validation uses `data-invalid` + `aria-invalid`.** `data-invalid` on `Field`, `aria-invalid` on the control. For disabled: `data-disabled` on `Field`, `disabled` on the control.
### Component Structure → [composition.md](./rules/composition.md)
- **Items always inside their Group.** `SelectItem``SelectGroup`. `DropdownMenuItem``DropdownMenuGroup`. `CommandItem``CommandGroup`.
- **Use `asChild` (radix) or `render` (base) for custom triggers.** Check `base` field from `npx shadcn@latest info`. → [base-vs-radix.md](./rules/base-vs-radix.md)
- **Dialog, Sheet, and Drawer always need a Title.** `DialogTitle`, `SheetTitle`, `DrawerTitle` required for accessibility. Use `className="sr-only"` if visually hidden.
- **Use full Card composition.** `CardHeader`/`CardTitle`/`CardDescription`/`CardContent`/`CardFooter`. Don't dump everything in `CardContent`.
- **Button has no `isPending`/`isLoading`.** Compose with `Spinner` + `data-icon` + `disabled`.
- **`TabsTrigger` must be inside `TabsList`.** Never render triggers directly in `Tabs`.
- **`Avatar` always needs `AvatarFallback`.** For when the image fails to load.
### Use Components, Not Custom Markup → [composition.md](./rules/composition.md)
- **Use existing components before custom markup.** Check if a component exists before writing a styled `div`.
- **Callouts use `Alert`.** Don't build custom styled divs.
- **Empty states use `Empty`.** Don't build custom empty state markup.
- **Toast via `sonner`.** Use `toast()` from `sonner`.
- **Use `Separator`** instead of `<hr>` or `<div className="border-t">`.
- **Use `Skeleton`** for loading placeholders. No custom `animate-pulse` divs.
- **Use `Badge`** instead of custom styled spans.
### Icons → [icons.md](./rules/icons.md)
- **Icons in `Button` use `data-icon`.** `data-icon="inline-start"` or `data-icon="inline-end"` on the icon.
- **No sizing classes on icons inside components.** Components handle icon sizing via CSS. No `size-4` or `w-4 h-4`.
- **Pass icons as objects, not string keys.** `icon={CheckIcon}`, not a string lookup.
### CLI
- **Never decode preset codes or build preset URLs manually.** Use `npx shadcn@latest preset decode <code>`, `preset url <code>`, or `preset open <code>`. For project-aware preset detection, use `npx shadcn@latest preset resolve`.
- **Apply preset codes directly with the CLI.** Use `npx shadcn@latest apply <code>` for existing projects, or `npx shadcn@latest init --preset <code>` when initializing.
## Key Patterns
These are the most common patterns that differentiate correct shadcn/ui code. For edge cases, see the linked rule files above.
```tsx
// Form layout: FieldGroup + Field, not div + Label.
<FieldGroup>
<Field>
<FieldLabel htmlFor="email">Email</FieldLabel>
<Input id="email" />
</Field>
</FieldGroup>
// Validation: data-invalid on Field, aria-invalid on the control.
<Field data-invalid>
<FieldLabel>Email</FieldLabel>
<Input aria-invalid />
<FieldDescription>Invalid email.</FieldDescription>
</Field>
// Icons in buttons: data-icon, no sizing classes.
<Button>
<SearchIcon data-icon="inline-start" />
Search
</Button>
// Spacing: gap-*, not space-y-*.
<div className="flex flex-col gap-4"> // correct
<div className="space-y-4"> // wrong
// Equal dimensions: size-*, not w-* h-*.
<Avatar className="size-10"> // correct
<Avatar className="w-10 h-10"> // wrong
// Status colors: Badge variants or semantic tokens, not raw colors.
<Badge variant="secondary">+20.1%</Badge> // correct
<span className="text-emerald-600">+20.1%</span> // wrong
```
## Component Selection
| Need | Use |
| -------------------------- | --------------------------------------------------------------------------------------------------- |
| Button/action | `Button` with appropriate variant |
| Form inputs | `Input`, `Select`, `Combobox`, `Switch`, `Checkbox`, `RadioGroup`, `Textarea`, `InputOTP`, `Slider` |
| Toggle between 25 options | `ToggleGroup` + `ToggleGroupItem` |
| Data display | `Table`, `Card`, `Badge`, `Avatar` |
| Navigation | `Sidebar`, `NavigationMenu`, `Breadcrumb`, `Tabs`, `Pagination` |
| Overlays | `Dialog` (modal), `Sheet` (side panel), `Drawer` (bottom sheet), `AlertDialog` (confirmation) |
| Feedback | `sonner` (toast), `Alert`, `Progress`, `Skeleton`, `Spinner` |
| Command palette | `Command` inside `Dialog` |
| Charts | `Chart` (wraps Recharts) |
| Layout | `Card`, `Separator`, `Resizable`, `ScrollArea`, `Accordion`, `Collapsible` |
| Empty states | `Empty` |
| Menus | `DropdownMenu`, `ContextMenu`, `Menubar` |
| Tooltips/info | `Tooltip`, `HoverCard`, `Popover` |
## Key Fields
The injected project context contains these key fields:
- **`aliases`** → use the actual alias prefix for imports (e.g. `@/`, `~/`), never hardcode.
- **`isRSC`** → when `true`, components using `useState`, `useEffect`, event handlers, or browser APIs need `"use client"` at the top of the file. Always reference this field when advising on the directive.
- **`tailwindVersion`** → `"v4"` uses `@theme inline` blocks; `"v3"` uses `tailwind.config.js`.
- **`tailwindCssFile`** → the global CSS file where custom CSS variables are defined. Always edit this file, never create a new one.
- **`style`** → component visual treatment (e.g. `nova`, `vega`).
- **`base`** → primitive library (`radix` or `base`). Affects component APIs and available props.
- **`iconLibrary`** → determines icon imports. Use `lucide-react` for `lucide`, `@tabler/icons-react` for `tabler`, etc. Never assume `lucide-react`.
- **`resolvedPaths`** → exact file-system destinations for components, utils, hooks, etc.
- **`framework`** → routing and file conventions (e.g. Next.js App Router vs Vite SPA).
- **`packageManager`** → use this for any non-shadcn dependency installs (e.g. `pnpm add date-fns` vs `npm install date-fns`).
- **`preset`** → resolved preset code and values for the current project. Use `npx shadcn@latest preset resolve --json` when you only need preset information.
See [cli.md — `info` command](./cli.md) for the full field reference.
## Component Docs, Examples, and Usage
Run `npx shadcn@latest docs <component>` to get the URLs for a component's documentation, examples, and API reference. Fetch these URLs to get the actual content.
```bash
npx shadcn@latest docs button dialog select
```
**When creating, fixing, debugging, or using a component, always run `npx shadcn@latest docs` and fetch the URLs first.** This ensures you're working with the correct API and usage patterns rather than guessing.
## Workflow
1. **Get project context** — already injected above. Run `npx shadcn@latest info` again if you need to refresh.
2. **Check installed components first** — before running `add`, always check the `components` list from project context or list the `resolvedPaths.ui` directory. Don't import components that haven't been added, and don't re-add ones already installed.
3. **Find components**`npx shadcn@latest search`.
4. **Get docs and examples** — run `npx shadcn@latest docs <component>` to get URLs, then fetch them. Use `npx shadcn@latest view` to browse registry items you haven't installed. To preview changes to installed components, use `npx shadcn@latest add --diff`.
5. **Install or update**`npx shadcn@latest add`. When updating existing components, use `--dry-run` and `--diff` to preview changes first (see [Updating Components](#updating-components) below).
6. **Fix imports in third-party components** — After adding components from community registries (e.g. `@bundui`, `@magicui`), check the added non-UI files for hardcoded import paths like `@/components/ui/...`. These won't match the project's actual aliases. Use `npx shadcn@latest info` to get the correct `ui` alias (e.g. `@workspace/ui/components`) and rewrite the imports accordingly. The CLI rewrites imports for its own UI files, but third-party registry components may use default paths that don't match the project.
7. **Review added components** — After adding a component or block from any registry, **always read the added files and verify they are correct**. Check for missing sub-components (e.g. `SelectItem` without `SelectGroup`), missing imports, incorrect composition, or violations of the [Critical Rules](#critical-rules). Also replace any icon imports with the project's `iconLibrary` from the project context (e.g. if the registry item uses `lucide-react` but the project uses `hugeicons`, swap the imports and icon names accordingly). Fix all issues before moving on.
8. **Registry must be explicit** — When the user asks to add a block or component, **do not guess the registry**. If no registry is specified (e.g. user says "add a login block" without specifying `@shadcn`, `@tailark`, `owner/repo`, etc.), ask which registry to use. Never default to a registry on behalf of the user.
9. **Switching presets** — Ask the user first: **overwrite**, **partial**, **merge**, or **skip**?
- **Inspect current preset**: `npx shadcn@latest preset resolve`. Use `--json` when you need structured values.
- **Inspect incoming preset**: `npx shadcn@latest preset decode <code>`. Use `preset url <code>` or `preset open <code>` to share or open the preset builder.
- **Overwrite**: `npx shadcn@latest apply <code>`. Overwrites detected components, fonts, and CSS variables.
- **Partial**: `npx shadcn@latest apply <code> --only theme,font`. Updates only the selected preset parts without reinstalling UI components. Supported values are `theme` and `font`; comma-separated combinations are allowed. `icon` is intentionally not supported, because icon changes may require full component reinstall and transforms.
- **Merge**: `npx shadcn@latest init --preset <code> --force --no-reinstall`, then run `npx shadcn@latest info` to list installed components, then for each installed component use `--dry-run` and `--diff` to [smart merge](#updating-components) it individually.
- **Skip**: `npx shadcn@latest init --preset <code> --force --no-reinstall`. Only updates config and CSS, leaves components as-is.
- **Important**: Always run preset commands inside the user's project directory. `apply` only works in an existing project with a `components.json` file. The CLI automatically preserves the current base (`base` vs `radix`) from `components.json`. If you must use a scratch/temp directory (e.g. for `--dry-run` comparisons), pass `--base <current-base>` explicitly — preset codes do not encode the base.
## Updating Components
When the user asks to update a component from upstream while keeping their local changes, use `--dry-run` and `--diff` to intelligently merge. **NEVER fetch raw files from GitHub manually — always use the CLI.**
1. Run `npx shadcn@latest add <component> --dry-run` to see all files that would be affected.
2. For each file, run `npx shadcn@latest add <component> --diff <file>` to see what changed upstream vs local.
3. Decide per file based on the diff:
- No local changes → safe to overwrite.
- Has local changes → read the local file, analyze the diff, and apply upstream updates while preserving local modifications.
- User says "just update everything" → use `--overwrite`, but confirm first.
4. **Never use `--overwrite` without the user's explicit approval.**
## Quick Reference
```bash
# Create a new project.
npx shadcn@latest init --name my-app --preset base-nova
npx shadcn@latest init --name my-app --preset a2r6bw --template vite
# Create a monorepo project.
npx shadcn@latest init --name my-app --preset base-nova --monorepo
npx shadcn@latest init --name my-app --preset base-nova --template next --monorepo
# Initialize existing project.
npx shadcn@latest init --preset base-nova
npx shadcn@latest init --defaults # shortcut: --template=next --preset=nova (base style implied)
# Apply a preset to an existing project.
npx shadcn@latest apply a2r6bw
npx shadcn@latest apply a2r6bw --only theme
npx shadcn@latest apply a2r6bw --only font
npx shadcn@latest apply a2r6bw --only theme,font
# Inspect preset codes and project preset state.
npx shadcn@latest preset decode a2r6bw
npx shadcn@latest preset url a2r6bw
npx shadcn@latest preset open a2r6bw
npx shadcn@latest preset resolve
npx shadcn@latest preset resolve --json
# Add components.
npx shadcn@latest add button card dialog
npx shadcn@latest add @magicui/shimmer-button
npx shadcn@latest add owner/repo/item
npx shadcn@latest add --all
# Preview changes before adding/updating.
npx shadcn@latest add button --dry-run
npx shadcn@latest add button --diff button.tsx
npx shadcn@latest add @acme/form --view button.tsx
npx shadcn@latest add owner/repo/item --dry-run
# Search registries.
npx shadcn@latest search @shadcn -q "sidebar"
npx shadcn@latest search @tailark -q "stats"
npx shadcn@latest search owner/repo -q "login"
npx shadcn@latest search # all configured registries
npx shadcn@latest search @shadcn -q "menu" -t ui # filter by item type
# Get component docs and example URLs.
npx shadcn@latest docs button dialog select
# View registry item details (for items not yet installed).
npx shadcn@latest view @shadcn/button
npx shadcn@latest view owner/repo/item
```
**Named presets:** `nova`, `vega`, `maia`, `lyra`, `mira`, `luma`
**Templates:** `next`, `vite`, `start`, `react-router`, `astro` (all support `--monorepo`) and `laravel` (not supported for monorepo)
**Preset codes:** Version-prefixed base62 strings (e.g. `a2r6bw` or `b0`), from [ui.shadcn.com](https://ui.shadcn.com).
## Detailed References
- [rules/forms.md](./rules/forms.md) — FieldGroup, Field, InputGroup, ToggleGroup, FieldSet, validation states
- [rules/composition.md](./rules/composition.md) — Groups, overlays, Card, Tabs, Avatar, Alert, Empty, Toast, Separator, Skeleton, Badge, Button loading
- [rules/icons.md](./rules/icons.md) — data-icon, icon sizing, passing icons as objects
- [rules/styling.md](./rules/styling.md) — Semantic colors, variants, className, spacing, size, truncate, dark mode, cn(), z-index
- [rules/base-vs-radix.md](./rules/base-vs-radix.md) — asChild vs render, Select, ToggleGroup, Slider, Accordion
- [cli.md](./cli.md) — Commands, flags, presets, templates
- [registry.md](./registry.md) — Authoring source registries, `include`, item definitions, dependencies, GitHub registry rules
- [customization.md](./customization.md) — Theming, CSS variables, extending components
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display_name: "shadcn/ui"
short_description: "Manages shadcn/ui components — adding, searching, fixing, debugging, styling, and composing UI."
icon_small: "./assets/shadcn-small.png"
icon_large: "./assets/shadcn.png"
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# shadcn CLI Reference
Configuration is read from `components.json`.
> **IMPORTANT:** Always run commands using the project's package runner: `npx shadcn@latest`, `pnpm dlx shadcn@latest`, or `bunx --bun shadcn@latest`. Check `packageManager` from project context to choose the right one. Examples below use `npx shadcn@latest` but substitute the correct runner for the project.
> **IMPORTANT:** Only use the flags documented below. Do not invent or guess flags — if a flag isn't listed here, it doesn't exist. The CLI auto-detects the package manager from the project's lockfile; there is no `--package-manager` flag.
## Contents
- Commands: init, apply, add (dry-run, smart merge), search, view, docs, info, build
- Templates: next, vite, start, react-router, astro
- Presets: named, code, URL formats and fields
- Switching presets
---
## Commands
### `init` — Initialize or create a project
```bash
npx shadcn@latest init [components...] [options]
```
Initializes shadcn/ui in an existing project or creates a new project (when `--name` is provided). Optionally installs components in the same step.
| Flag | Short | Description | Default |
| ----------------------- | ----- | --------------------------------------------------------- | ------- |
| `--template <template>` | `-t` | Template (next, start, vite, next-monorepo, react-router) | — |
| `--preset [name]` | `-p` | Preset configuration (named, code, or URL) | — |
| `--yes` | `-y` | Skip confirmation prompt | `true` |
| `--defaults` | `-d` | Use defaults (`--template=next --preset=base-nova`) | `false` |
| `--force` | `-f` | Force overwrite existing configuration | `false` |
| `--cwd <cwd>` | `-c` | Working directory | current |
| `--name <name>` | `-n` | Name for new project | — |
| `--silent` | `-s` | Mute output | `false` |
| `--rtl` | | Enable RTL support | — |
| `--reinstall` | | Re-install existing UI components | `false` |
| `--monorepo` | | Scaffold a monorepo project | — |
| `--no-monorepo` | | Skip the monorepo prompt | — |
`npx shadcn@latest create` is an alias for `npx shadcn@latest init`.
### `apply` — Apply a preset to an existing project
```bash
npx shadcn@latest apply [preset] [options]
```
Applies a preset to an existing project, overwriting preset-driven config, fonts, CSS variables, and detected UI components.
| Flag | Short | Description | Default |
| ------------------- | ----- | ------------------------------------------ | ------- |
| `--preset <preset>` | — | Preset configuration (named, code, or URL) | — |
| `--yes` | `-y` | Skip confirmation prompt | `false` |
| `--cwd <cwd>` | `-c` | Working directory | current |
| `--silent` | `-s` | Mute output | `false` |
`[preset]` is a shorthand for `--preset <preset>`. If both are provided, they must match.
If no preset is provided, the CLI offers to open the custom preset builder on `ui.shadcn.com/create`.
### `add` — Add components
> **IMPORTANT:** To compare local components against upstream or to preview changes, ALWAYS use `npx shadcn@latest add <component> --dry-run`, `--diff`, or `--view`. NEVER fetch raw files from GitHub or other sources manually. The CLI handles registry resolution, file paths, and CSS diffing automatically.
```bash
npx shadcn@latest add [components...] [options]
```
Accepts component names, registry-prefixed names (`@magicui/shimmer-button`),
GitHub item addresses (`owner/repo/item`), URLs, or local paths.
| Flag | Short | Description | Default |
| --------------- | ----- | -------------------------------------------------------------------------------------------------------------------- | ------- |
| `--yes` | `-y` | Skip confirmation prompt | `false` |
| `--overwrite` | `-o` | Overwrite existing files | `false` |
| `--cwd <cwd>` | `-c` | Working directory | current |
| `--all` | `-a` | Add all available components | `false` |
| `--path <path>` | `-p` | Target path for the component | — |
| `--silent` | `-s` | Mute output | `false` |
| `--dry-run` | | Preview all changes without writing files | `false` |
| `--diff [path]` | | Show diffs. Without a path, shows the first 5 files. With a path, shows that file only (implies `--dry-run`) | — |
| `--view [path]` | | Show file contents. Without a path, shows the first 5 files. With a path, shows that file only (implies `--dry-run`) | — |
#### Dry-Run Mode
Use `--dry-run` to preview what `add` would do without writing any files. `--diff` and `--view` both imply `--dry-run`.
```bash
# Preview all changes.
npx shadcn@latest add button --dry-run
# Show diffs for all files (top 5).
npx shadcn@latest add button --diff
# Show the diff for a specific file.
npx shadcn@latest add button --diff button.tsx
# Show contents for all files (top 5).
npx shadcn@latest add button --view
# Show the full content of a specific file.
npx shadcn@latest add button --view button.tsx
# Works with URLs too.
npx shadcn@latest add https://api.npoint.io/abc123 --dry-run
# Works with public GitHub registries too.
npx shadcn@latest add owner/repo/item --dry-run
# CSS diffs.
npx shadcn@latest add button --diff globals.css
```
**When to use dry-run:**
- When the user asks "what files will this add?" or "what will this change?" — use `--dry-run`.
- Before overwriting existing components — use `--diff` to preview the changes first.
- When the user wants to inspect component source code without installing — use `--view`.
- When checking what CSS changes would be made to `globals.css` — use `--diff globals.css`.
- When the user asks to review or audit third-party registry code before installing — use `--view` to inspect the source.
> **`npx shadcn@latest add --dry-run` vs `npx shadcn@latest view`:** Prefer `npx shadcn@latest add --dry-run/--diff/--view` over `npx shadcn@latest view` when the user wants to preview changes to their project. `npx shadcn@latest view` only shows raw registry metadata. `npx shadcn@latest add --dry-run` shows exactly what would happen in the user's project: resolved file paths, diffs against existing files, and CSS updates. Use `npx shadcn@latest view` only when the user wants to browse registry info without a project context.
#### Smart Merge from Upstream
See [Updating Components in SKILL.md](./SKILL.md#updating-components) for the full workflow.
### `search` — Search registries
```bash
npx shadcn@latest search [registries...] [options]
```
Fuzzy search across registries. Also aliased as `npx shadcn@latest list`.
Supports namespaces (`@acme`), public GitHub registry sources (`owner/repo`),
and registry catalog URLs. Without `-q`, lists all items. When no registries are
passed, searches every registry configured in `components.json`.
| Flag | Short | Description | Default |
| ------------------- | ----- | ------------------------------------------------- | ------- |
| `--query <query>` | `-q` | Search query | — |
| `--type <type>` | `-t` | Filter by item type (e.g. `ui`, `block`, `hook`); comma-separated | — |
| `--limit <number>` | `-l` | Max items to display | `100` |
| `--offset <number>` | `-o` | Items to skip | `0` |
| `--json` | | Output as JSON | `false` |
| `--cwd <cwd>` | `-c` | Working directory | current |
### `view` — View item details
```bash
npx shadcn@latest view <items...> [options]
```
Displays item info including file contents. Examples:
`npx shadcn@latest view @shadcn/button`,
`npx shadcn@latest view owner/repo/item`.
### `docs` — Get component documentation URLs
```bash
npx shadcn@latest docs <components...> [options]
```
Outputs resolved URLs for component documentation, examples, and API references. Accepts one or more component names. Fetch the URLs to get the actual content.
Example output for `npx shadcn@latest docs input button`:
```
base radix
input
docs https://ui.shadcn.com/docs/components/radix/input
examples https://raw.githubusercontent.com/.../examples/input-example.tsx
button
docs https://ui.shadcn.com/docs/components/radix/button
examples https://raw.githubusercontent.com/.../examples/button-example.tsx
```
Some components include an `api` link to the underlying library (e.g. `cmdk` for the command component).
### `diff` — Check for updates
Do not use this command. Use `npx shadcn@latest add --diff` instead.
### `info` — Project information
```bash
npx shadcn@latest info [options]
```
Displays project info and `components.json` configuration. Run this first to discover the project's framework, aliases, Tailwind version, and resolved paths.
| Flag | Short | Description | Default |
| ------------- | ----- | ----------------- | ------- |
| `--cwd <cwd>` | `-c` | Working directory | current |
**Project Info fields:**
| Field | Type | Meaning |
| -------------------- | --------- | ------------------------------------------------------------------ |
| `framework` | `string` | Detected framework (`next`, `vite`, `react-router`, `start`, etc.) |
| `frameworkVersion` | `string` | Framework version (e.g. `15.2.4`) |
| `isSrcDir` | `boolean` | Whether the project uses a `src/` directory |
| `isRSC` | `boolean` | Whether React Server Components are enabled |
| `isTsx` | `boolean` | Whether the project uses TypeScript |
| `tailwindVersion` | `string` | `"v3"` or `"v4"` |
| `tailwindConfigFile` | `string` | Path to the Tailwind config file |
| `tailwindCssFile` | `string` | Path to the global CSS file |
| `aliasPrefix` | `string` | Import alias prefix (e.g. `@`, `~`, `@/`) |
| `packageManager` | `string` | Detected package manager (`npm`, `pnpm`, `yarn`, `bun`) |
**Components.json fields:**
| Field | Type | Meaning |
| -------------------- | --------- | ------------------------------------------------------------------------------------------ |
| `base` | `string` | Primitive library (`radix` or `base`) — determines component APIs and available props |
| `style` | `string` | Visual style (e.g. `nova`, `vega`) |
| `rsc` | `boolean` | RSC flag from config |
| `tsx` | `boolean` | TypeScript flag |
| `tailwind.config` | `string` | Tailwind config path |
| `tailwind.css` | `string` | Global CSS path — this is where custom CSS variables go |
| `iconLibrary` | `string` | Icon library — determines icon import package (e.g. `lucide-react`, `@tabler/icons-react`) |
| `aliases.components` | `string` | Component import alias (e.g. `@/components`) |
| `aliases.utils` | `string` | Utils import alias (e.g. `@/lib/utils`) |
| `aliases.ui` | `string` | UI component alias (e.g. `@/components/ui`) |
| `aliases.lib` | `string` | Lib alias (e.g. `@/lib`) |
| `aliases.hooks` | `string` | Hooks alias (e.g. `@/hooks`) |
| `resolvedPaths` | `object` | Absolute file-system paths for each alias |
| `registries` | `object` | Configured custom registries |
**Links fields:**
The `info` output includes a **Links** section with templated URLs for component docs, source, and examples. For resolved URLs, use `npx shadcn@latest docs <component>` instead.
### `build` — Build a custom registry
```bash
npx shadcn@latest build [registry] [options]
```
Builds `registry.json` into individual JSON files for distribution. Default input: `./registry.json`, default output: `./public/r`.
For authoring rules, `include`, item definitions, `registryDependencies`, and
GitHub registry behavior, see [registry.md](./registry.md).
| Flag | Short | Description | Default |
| ----------------- | ----- | ----------------- | ------------ |
| `--output <path>` | `-o` | Output directory | `./public/r` |
| `--cwd <cwd>` | `-c` | Working directory | current |
---
## Templates
| Value | Framework | Monorepo support |
| -------------- | -------------- | ---------------- |
| `next` | Next.js | Yes |
| `vite` | Vite | Yes |
| `start` | TanStack Start | Yes |
| `react-router` | React Router | Yes |
| `astro` | Astro | Yes |
| `laravel` | Laravel | No |
All templates support monorepo scaffolding via the `--monorepo` flag. When passed, the CLI uses a monorepo-specific template directory (e.g. `next-monorepo`, `vite-monorepo`). When neither `--monorepo` nor `--no-monorepo` is passed, the CLI prompts interactively. Laravel does not support monorepo scaffolding.
---
## Presets
Three ways to specify a preset via `--preset`:
1. **Named:** `--preset nova` or `--preset lyra`
2. **Code:** `--preset a2r6bw` (version-prefixed base62 string, e.g. `a2r6bw` or `b0`)
3. **URL:** `--preset "https://ui.shadcn.com/init?base=radix&style=nova&..."`
> **IMPORTANT:** Never try to decode, fetch, or resolve preset codes manually. Preset codes are opaque — pass them directly to `npx shadcn@latest init --preset <code>` and let the CLI handle resolution.
> Use `npx shadcn@latest apply --preset <code>` when overwriting an existing project's preset.
## Switching Presets
Ask the user first: **overwrite**, **merge**, or **skip** existing components?
- **Overwrite / Re-install** → `npx shadcn@latest apply --preset <code>`. Overwrites all detected component files with the new preset styles. Use when the user hasn't customized components.
- **Merge** → `npx shadcn@latest init --preset <code> --force --no-reinstall`, then run `npx shadcn@latest info` to get the list of installed components and use the [smart merge workflow](./SKILL.md#updating-components) to update them one by one, preserving local changes. Use when the user has customized components.
- **Skip** → `npx shadcn@latest init --preset <code> --force --no-reinstall`. Only updates config and CSS variables, leaves existing components as-is.
Always run preset commands inside the user's project directory. `apply` only works in an existing project with a `components.json` file. The CLI automatically preserves the current base (`base` vs `radix`) from `components.json`. If you must use a scratch/temp directory (e.g. for `--dry-run` comparisons), pass `--base <current-base>` explicitly — preset codes do not encode the base.
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# Customization & Theming
Components reference semantic CSS variable tokens. Change the variables to change every component.
## Contents
- How it works (CSS variables → Tailwind utilities → components)
- Color variables and OKLCH format
- Dark mode setup
- Changing the theme (presets, CSS variables)
- Adding custom colors (Tailwind v3 and v4)
- Border radius
- Customizing components (variants, className, wrappers)
- Checking for updates
---
## How It Works
1. CSS variables defined in `:root` (light) and `.dark` (dark mode).
2. Tailwind maps them to utilities: `bg-primary`, `text-muted-foreground`, etc.
3. Components use these utilities — changing a variable changes all components that reference it.
---
## Color Variables
Every color follows the `name` / `name-foreground` convention. The base variable is for backgrounds, `-foreground` is for text/icons on that background.
| Variable | Purpose |
| -------------------------------------------- | -------------------------------- |
| `--background` / `--foreground` | Page background and default text |
| `--card` / `--card-foreground` | Card surfaces |
| `--primary` / `--primary-foreground` | Primary buttons and actions |
| `--secondary` / `--secondary-foreground` | Secondary actions |
| `--muted` / `--muted-foreground` | Muted/disabled states |
| `--accent` / `--accent-foreground` | Hover and accent states |
| `--destructive` / `--destructive-foreground` | Error and destructive actions |
| `--border` | Default border color |
| `--input` | Form input borders |
| `--ring` | Focus ring color |
| `--chart-1` through `--chart-5` | Chart/data visualization |
| `--sidebar-*` | Sidebar-specific colors |
| `--surface` / `--surface-foreground` | Secondary surface |
Colors use OKLCH: `--primary: oklch(0.205 0 0)` where values are lightness (01), chroma (0 = gray), and hue (0360).
---
## Dark Mode
Class-based toggle via `.dark` on the root element. In Next.js, use `next-themes`:
```tsx
import { ThemeProvider } from "next-themes"
<ThemeProvider attribute="class" defaultTheme="system" enableSystem>
{children}
</ThemeProvider>
```
---
## Changing the Theme
```bash
# Apply a preset code from ui.shadcn.com.
npx shadcn@latest apply --preset a2r6bw
# Positional shorthand also works.
npx shadcn@latest apply a2r6bw
# Switch to a named preset and overwrite existing components.
npx shadcn@latest apply --preset nova
# Preserve existing components instead.
npx shadcn@latest init --preset nova --force --no-reinstall
# Use a custom theme URL.
npx shadcn@latest apply --preset "https://ui.shadcn.com/init?base=radix&style=nova&theme=blue&..."
```
Or edit CSS variables directly in `globals.css`.
---
## Adding Custom Colors
Add variables to the file at `tailwindCssFile` from `npx shadcn@latest info` (typically `globals.css`). Never create a new CSS file for this.
```css
/* 1. Define in the global CSS file. */
:root {
--warning: oklch(0.84 0.16 84);
--warning-foreground: oklch(0.28 0.07 46);
}
.dark {
--warning: oklch(0.41 0.11 46);
--warning-foreground: oklch(0.99 0.02 95);
}
```
```css
/* 2a. Register with Tailwind v4 (@theme inline). */
@theme inline {
--color-warning: var(--warning);
--color-warning-foreground: var(--warning-foreground);
}
```
When `tailwindVersion` is `"v3"` (check via `npx shadcn@latest info`), register in `tailwind.config.js` instead:
```js
// 2b. Register with Tailwind v3 (tailwind.config.js).
module.exports = {
theme: {
extend: {
colors: {
warning: "oklch(var(--warning) / <alpha-value>)",
"warning-foreground":
"oklch(var(--warning-foreground) / <alpha-value>)",
},
},
},
}
```
```tsx
// 3. Use in components.
<div className="bg-warning text-warning-foreground">Warning</div>
```
---
## Border Radius
`--radius` controls border radius globally. Components derive values from it (`rounded-lg` = `var(--radius)`, `rounded-md` = `calc(var(--radius) - 2px)`).
---
## Customizing Components
See also: [rules/styling.md](./rules/styling.md) for Incorrect/Correct examples.
Prefer these approaches in order:
### 1. Built-in variants
```tsx
<Button variant="outline" size="sm">
Click
</Button>
```
### 2. Tailwind classes via `className`
```tsx
<Card className="mx-auto max-w-md">...</Card>
```
### 3. Add a new variant
Edit the component source to add a variant via `cva`:
```tsx
// components/ui/button.tsx
warning: "bg-warning text-warning-foreground hover:bg-warning/90",
```
### 4. Wrapper components
Compose shadcn/ui primitives into higher-level components:
```tsx
export function ConfirmDialog({ title, description, onConfirm, children }) {
return (
<AlertDialog>
<AlertDialogTrigger asChild>{children}</AlertDialogTrigger>
<AlertDialogContent>
<AlertDialogHeader>
<AlertDialogTitle>{title}</AlertDialogTitle>
<AlertDialogDescription>{description}</AlertDialogDescription>
</AlertDialogHeader>
<AlertDialogFooter>
<AlertDialogCancel>Cancel</AlertDialogCancel>
<AlertDialogAction onClick={onConfirm}>Confirm</AlertDialogAction>
</AlertDialogFooter>
</AlertDialogContent>
</AlertDialog>
)
}
```
---
## Checking for Updates
```bash
npx shadcn@latest add button --diff
```
To preview exactly what would change before updating, use `--dry-run` and `--diff`:
```bash
npx shadcn@latest add button --dry-run # see all affected files
npx shadcn@latest add button --diff button.tsx # see the diff for a specific file
```
See [Updating Components in SKILL.md](./SKILL.md#updating-components) for the full smart merge workflow.
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{
"skill_name": "shadcn",
"evals": [
{
"id": 1,
"prompt": "I'm building a Next.js app with shadcn/ui (base-nova preset, lucide icons). Create a settings form component with fields for: full name, email address, and notification preferences (email, SMS, push notifications as toggle options). Add validation states for required fields.",
"expected_output": "A React component using FieldGroup, Field, ToggleGroup, data-invalid/aria-invalid validation, gap-* spacing, and semantic colors.",
"files": [],
"expectations": [
"Uses FieldGroup and Field components for form layout instead of raw div with space-y",
"Uses Switch for independent on/off notification toggles (not looping Button with manual active state)",
"Uses data-invalid on Field and aria-invalid on the input control for validation states",
"Uses gap-* (e.g. gap-4, gap-6) instead of space-y-* or space-x-* for spacing",
"Uses semantic color tokens (e.g. bg-background, text-muted-foreground, text-destructive) instead of raw colors like bg-red-500",
"No manual dark: color overrides"
]
},
{
"id": 2,
"prompt": "Create a dialog component for editing a user profile. It should have the user's avatar at the top, input fields for name and bio, and Save/Cancel buttons with appropriate icons. Using shadcn/ui with radix-nova preset and tabler icons.",
"expected_output": "A React component with DialogTitle, Avatar+AvatarFallback, data-icon on icon buttons, no icon sizing classes, tabler icon imports.",
"files": [],
"expectations": [
"Includes DialogTitle for accessibility (visible or with sr-only class)",
"Avatar component includes AvatarFallback",
"Icons on buttons use the data-icon attribute (data-icon=\"inline-start\" or data-icon=\"inline-end\")",
"No sizing classes on icons inside components (no size-4, w-4, h-4, etc.)",
"Uses tabler icons (@tabler/icons-react) instead of lucide-react",
"Uses asChild for custom triggers (radix preset)"
]
},
{
"id": 3,
"prompt": "Create a dashboard component that shows 4 stat cards in a grid. Each card has a title, large number, percentage change badge, and a loading skeleton state. Using shadcn/ui with base-nova preset and lucide icons.",
"expected_output": "A React component with full Card composition, Skeleton for loading, Badge for changes, semantic colors, gap-* spacing.",
"files": [],
"expectations": [
"Uses full Card composition with CardHeader, CardTitle, CardContent (not dumping everything into CardContent)",
"Uses Skeleton component for loading placeholders instead of custom animate-pulse divs",
"Uses Badge component for percentage change instead of custom styled spans",
"Uses semantic color tokens instead of raw color values like bg-green-500 or text-red-600",
"Uses gap-* instead of space-y-* or space-x-* for spacing",
"Uses size-* when width and height are equal instead of separate w-* h-*"
]
}
]
}
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# shadcn MCP Server
The CLI includes an MCP server that lets AI assistants search, browse, view, and install items from registries.
---
## Setup
```bash
shadcn mcp # start the MCP server (stdio)
shadcn mcp init # write config for your editor
```
Editor config files:
| Editor | Config file |
| ----------- | ------------------------------- |
| Claude Code | `.mcp.json` |
| Cursor | `.cursor/mcp.json` |
| VS Code | `.vscode/mcp.json` |
| OpenCode | `opencode.json` |
| Codex | `~/.codex/config.toml` (manual) |
---
## Tools
> **Tip:** MCP tools handle registry operations (search, view, install). For project configuration (aliases, framework, Tailwind version), use `npx shadcn@latest info` — there is no MCP equivalent.
### `shadcn:get_project_registries`
Returns registry names from `components.json`. Errors if no `components.json` exists.
**Input:** none
### `shadcn:list_items_in_registries`
Lists all items from one or more registries. Registries can be configured
namespaces such as `@acme`, public GitHub sources such as `owner/repo`, or
registry catalog URLs. Omit `registries` to list from every registry configured
in `components.json`.
**Input:** `registries` (string[], optional — omit for all configured), `types` (string[], optional — e.g. `["ui", "block"]`), `limit` (number, optional, defaults to 100), `offset` (number, optional)
### `shadcn:search_items_in_registries`
Fuzzy search across registries. Registries can be configured namespaces, public
GitHub sources, or registry catalog URLs. Omit `registries` to search every
registry configured in `components.json` — e.g. "find me a hero" across all
configured registries.
**Input:** `registries` (string[], optional — omit for all configured), `query` (string), `types` (string[], optional — e.g. `["ui", "block"]`), `limit` (number, optional, defaults to 100), `offset` (number, optional)
### `shadcn:view_items_in_registries`
View item details including full file contents.
**Input:** `items` (string[]) — e.g.
`["@shadcn/button", "@shadcn/card", "owner/repo/item"]`
### `shadcn:get_item_examples_from_registries`
Find usage examples and demos with source code. Omit `registries` to search
every registry configured in `components.json`.
**Input:** `registries` (string[], optional — omit for all configured), `query` (string) — e.g. `"accordion-demo"`, `"button example"`
### `shadcn:get_add_command_for_items`
Returns the CLI install command.
**Input:** `items` (string[]) — e.g. `["@shadcn/button"]`
### `shadcn:get_audit_checklist`
Returns a checklist for verifying components (imports, deps, lint, TypeScript).
**Input:** none
---
## Configuring Registries
Namespaced and authenticated registries are set in `components.json`. The
`@shadcn` registry is always built-in. Public GitHub registries can also be used
directly as `owner/repo` registry sources when the repository has a root
`registry.json`; they do not need `components.json` configuration.
```json
{
"registries": {
"@acme": "https://acme.com/r/{name}.json",
"@private": {
"url": "https://private.com/r/{name}.json",
"headers": { "Authorization": "Bearer ${MY_TOKEN}" }
}
}
}
```
- Names must start with `@`.
- URLs must contain `{name}`.
- `${VAR}` references are resolved from environment variables.
Community registry index: `https://ui.shadcn.com/r/registries.json`
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# Registry Authoring and Addresses
Use this reference when the user wants to create, fix, publish, or reason about
a shadcn registry.
## Mental Model
A registry has two forms:
- **Source registry**: an authored `registry.json` in a project or repository.
It may use `include` and file paths that point at source files.
- **Built registry**: generated JSON files served to CLI consumers, usually
from `public/r`. Use `npx shadcn@latest build` to create this form.
The CLI installer consumes registry item payloads. A source registry is a way to
author those payloads from real files.
Registry items are not limited to React components. They can distribute
components, hooks, utilities, design tokens, pages, config files, docs, rules,
workflows, templates, MCP files, and other project files.
## Root `registry.json`
The root registry file should define registry metadata and either `items` or
`include`.
```json
{
"$schema": "https://ui.shadcn.com/schema/registry.json",
"name": "acme",
"homepage": "https://acme.com",
"items": [
{
"name": "absolute-url",
"type": "registry:lib",
"title": "Absolute URL",
"description": "A utility to turn any path into an absolute URL.",
"files": [
{
"path": "lib/absolute-url.ts",
"type": "registry:lib"
}
]
}
]
}
```
Root registry rules:
- Root `registry.json` must include `name` and `homepage`.
- `items` is an array of registry item definitions.
- `include` may be used to split the source registry into multiple files.
- Included registry files may omit `name` and `homepage`.
## Include
Use `include` to keep large registries modular.
```json
{
"$schema": "https://ui.shadcn.com/schema/registry.json",
"name": "acme",
"homepage": "https://acme.com",
"include": ["registry/ui/registry.json", "registry/blocks/registry.json"]
}
```
Include rules:
- Include paths are relative to the `registry.json` that declares them.
- Include paths must explicitly point to a `registry.json` file.
- Do not use remote URLs, absolute paths, or parent traversal (`..`).
- Item file paths are relative to the registry file that declares the item.
- Duplicate item names fail across the resolved registry.
Example included file:
```json
{
"items": [
{
"name": "button",
"type": "registry:ui",
"files": [
{
"path": "button.tsx",
"type": "registry:ui"
}
]
}
]
}
```
If this file is at `registry/ui/registry.json`, then `button.tsx` is read from
`registry/ui/button.tsx`, and the built item path is emitted relative to the
root registry.
## Item Definitions
Common item fields:
```json
{
"name": "login-form",
"type": "registry:block",
"title": "Login Form",
"description": "A login form with email and password fields.",
"dependencies": ["zod"],
"registryDependencies": ["button", "input", "label"],
"files": [
{
"path": "blocks/login-form.tsx",
"type": "registry:block"
}
],
"cssVars": {
"light": {
"brand": "oklch(0.62 0.18 250)"
},
"dark": {
"brand": "oklch(0.72 0.16 250)"
}
}
}
```
Important fields:
- `name`: the installable item name. It is not necessarily a file path.
- `type`: one of the registry item types, such as `registry:ui`,
`registry:block`, `registry:lib`, `registry:hook`, `registry:file`,
`registry:page`, `registry:theme`, `registry:style`, `registry:font`, or
`registry:item`.
- `files`: source files copied or generated by the item.
- `dependencies`: npm runtime dependencies.
- `devDependencies`: npm development dependencies.
- `registryDependencies`: other registry items required by this item.
- `cssVars`, `css`, `tailwind`, `envVars`, and `docs`: optional install-time
additions.
File rules:
- File paths are relative to the declaring `registry.json`.
- `registry:file` and `registry:page` files require a `target`.
- Do not use remote file URLs in source registry file paths.
- Keep source files copy-pasteable: no hidden app-only imports.
## Registry Dependencies
`registryDependencies` entries are item addresses, not file paths.
```json
{
"name": "login-form",
"type": "registry:block",
"registryDependencies": ["button", "@acme/input", "acme/ui/card#v1.2.0"],
"files": [
{
"path": "blocks/login-form.tsx",
"type": "registry:block"
}
]
}
```
Dependency rules:
- Bare names such as `"button"` mean official shadcn items.
- Bare names never mean same-registry or same-repository items.
- Namespaced dependencies use `@namespace/item-name`.
- GitHub dependencies use `owner/repo/item-name`.
- Pin GitHub dependencies with `owner/repo/item-name#ref` when needed.
- Refs are not inherited. If `owner/repo/foo#v2` depends on `bar` from the same
repo at `v2`, write `owner/repo/bar#v2`.
- Do not use relative dependencies such as `"./bar"`.
## Address Schemes
When reasoning about a registry item string, classify it first.
| Address | Scheme | Meaning |
| ----------------------------------- | --------- | ------------------------------------------------------------ |
| `button` | shadcn | Official shadcn item named `button`. |
| `@acme/button` | namespace | Item `button` from configured registry `@acme`. |
| `@acme/ui/button` | namespace | Item `ui/button` from configured registry `@acme`. |
| `https://example.com/r/button.json` | url | Built registry item JSON at that URL. |
| `./button.json` | file | Built registry item JSON on disk. |
| `acme/ui/button` | github | Item `button` from GitHub repo `acme/ui`. |
| `acme/ui/forms/login#main` | github | Item `forms/login` from GitHub repo `acme/ui` at ref `main`. |
For namespace and GitHub addresses, slashful item names are allowed and are item
names, not file paths. Addresses ending in `.json` keep file-address
precedence, so `acme/ui/data/schema.json` is treated as a file path, not a
GitHub item address.
## GitHub Registries
A public GitHub repository can act as a source registry when it has a root
`registry.json`.
```txt
owner/repo/item-name[#ref]
```
Rules:
- The first two path segments are GitHub owner and repo.
- All remaining path segments are the registry item name.
- The source entrypoint is always root `registry.json`.
- GitHub registries are source registries consumed directly by the CLI. They do
not require `shadcn build` or generated item JSON files.
- `include` follows the same source-registry rules as local registries.
- Currently, GitHub addresses support public `github.com` repositories only.
- Private repos and GitHub Enterprise require explicit product decisions.
When implementing GitHub registry fetching, resolve refs to a commit SHA before
reading source files. Do not read moving refs directly from
`raw.githubusercontent.com`, because branch-like refs can be cached for several
minutes.
Preferred flow:
```txt
owner/repo[#ref]
-> resolve ref with git ls-remote
-> commit SHA
-> read https://raw.githubusercontent.com/{owner}/{repo}/{sha}/registry.json
-> read includes and item files from the same SHA
```
This keeps a command on one consistent repository snapshot.
Full 40-character commit SHAs are already stable and can be used directly.
Branches, tags, and short refs require Git so the CLI can resolve them to a
commit SHA first.
## Build and Verify
Use the CLI to build source registries:
```bash
npx shadcn@latest build
npx shadcn@latest build registry.json --output public/r
```
Use CLI commands to inspect the result:
```bash
npx shadcn@latest list @acme
npx shadcn@latest search @acme -q "login"
npx shadcn@latest view @acme/login-form
npx shadcn@latest add @acme/login-form --dry-run
npx shadcn@latest registry validate ./registry.json
```
Use GitHub addresses directly for public GitHub registries:
```bash
npx shadcn@latest list owner/repo
npx shadcn@latest search owner/repo -q "login"
npx shadcn@latest view owner/repo/item
npx shadcn@latest add owner/repo/item --dry-run
npx shadcn@latest registry validate owner/repo
```
When working on registry implementation in the shadcn/ui codebase:
- Keep address parsing pure and testable.
- Do not add side effects to validators.
- Preserve existing behavior for official shadcn, namespace, URL, and file
schemes.
- Add tests for address parsing, source loading, dependency resolution, list,
search, view, and add paths.
- Prefer small source-reader abstractions over a plugin system until there are
multiple real providers.
@@ -0,0 +1,306 @@
# Base vs Radix
API differences between `base` and `radix`. Check the `base` field from `npx shadcn@latest info`.
## Contents
- Composition: asChild vs render
- Button / trigger as non-button element
- Select (items prop, placeholder, positioning, multiple, object values)
- ToggleGroup (type vs multiple)
- Slider (scalar vs array)
- Accordion (type and defaultValue)
---
## Composition: asChild (radix) vs render (base)
Radix uses `asChild` to replace the default element. Base uses `render`. Don't wrap triggers in extra elements.
**Incorrect:**
```tsx
<DialogTrigger>
<div>
<Button>Open</Button>
</div>
</DialogTrigger>
```
**Correct (radix):**
```tsx
<DialogTrigger asChild>
<Button>Open</Button>
</DialogTrigger>
```
**Correct (base):**
```tsx
<DialogTrigger render={<Button />}>Open</DialogTrigger>
```
This applies to all trigger and close components: `DialogTrigger`, `SheetTrigger`, `AlertDialogTrigger`, `DropdownMenuTrigger`, `PopoverTrigger`, `TooltipTrigger`, `CollapsibleTrigger`, `DialogClose`, `SheetClose`, `NavigationMenuLink`, `BreadcrumbLink`, `SidebarMenuButton`, `Badge`, `Item`.
---
## Button / trigger as non-button element (base only)
When `render` changes an element to a non-button (`<a>`, `<span>`), add `nativeButton={false}`.
**Incorrect (base):** missing `nativeButton={false}`.
```tsx
<Button render={<a href="/docs" />}>Read the docs</Button>
```
**Correct (base):**
```tsx
<Button render={<a href="/docs" />} nativeButton={false}>
Read the docs
</Button>
```
**Correct (radix):**
```tsx
<Button asChild>
<a href="/docs">Read the docs</a>
</Button>
```
Same for triggers whose `render` is not a `Button`:
```tsx
// base.
<PopoverTrigger render={<InputGroupAddon />} nativeButton={false}>
Pick date
</PopoverTrigger>
```
---
## Select
**items prop (base only).** Base requires an `items` prop on the root. Radix uses inline JSX only.
**Incorrect (base):**
```tsx
<Select>
<SelectTrigger><SelectValue placeholder="Select a fruit" /></SelectTrigger>
</Select>
```
**Correct (base):**
```tsx
const items = [
{ label: "Select a fruit", value: null },
{ label: "Apple", value: "apple" },
{ label: "Banana", value: "banana" },
]
<Select items={items}>
<SelectTrigger>
<SelectValue />
</SelectTrigger>
<SelectContent>
<SelectGroup>
{items.map((item) => (
<SelectItem key={item.value} value={item.value}>{item.label}</SelectItem>
))}
</SelectGroup>
</SelectContent>
</Select>
```
**Correct (radix):**
```tsx
<Select>
<SelectTrigger>
<SelectValue placeholder="Select a fruit" />
</SelectTrigger>
<SelectContent>
<SelectGroup>
<SelectItem value="apple">Apple</SelectItem>
<SelectItem value="banana">Banana</SelectItem>
</SelectGroup>
</SelectContent>
</Select>
```
**Placeholder.** Base uses a `{ value: null }` item in the items array. Radix uses `<SelectValue placeholder="...">`.
**Content positioning.** Base uses `alignItemWithTrigger`. Radix uses `position`.
```tsx
// base.
<SelectContent alignItemWithTrigger={false} side="bottom">
// radix.
<SelectContent position="popper">
```
---
## Select — multiple selection and object values (base only)
Base supports `multiple`, render-function children on `SelectValue`, and object values with `itemToStringValue`. Radix is single-select with string values only.
**Correct (base — multiple selection):**
```tsx
<Select items={items} multiple defaultValue={[]}>
<SelectTrigger>
<SelectValue>
{(value: string[]) => value.length === 0 ? "Select fruits" : `${value.length} selected`}
</SelectValue>
</SelectTrigger>
...
</Select>
```
**Correct (base — object values):**
```tsx
<Select defaultValue={plans[0]} itemToStringValue={(plan) => plan.name}>
<SelectTrigger>
<SelectValue>{(value) => value.name}</SelectValue>
</SelectTrigger>
...
</Select>
```
---
## ToggleGroup
Base uses a `multiple` boolean prop. Radix uses `type="single"` or `type="multiple"`.
**Incorrect (base):**
```tsx
<ToggleGroup type="single" defaultValue="daily">
<ToggleGroupItem value="daily">Daily</ToggleGroupItem>
</ToggleGroup>
```
**Correct (base):**
```tsx
// Single (no prop needed), defaultValue is always an array.
<ToggleGroup defaultValue={["daily"]} spacing={2}>
<ToggleGroupItem value="daily">Daily</ToggleGroupItem>
<ToggleGroupItem value="weekly">Weekly</ToggleGroupItem>
</ToggleGroup>
// Multi-selection.
<ToggleGroup multiple>
<ToggleGroupItem value="bold">Bold</ToggleGroupItem>
<ToggleGroupItem value="italic">Italic</ToggleGroupItem>
</ToggleGroup>
```
**Correct (radix):**
```tsx
// Single, defaultValue is a string.
<ToggleGroup type="single" defaultValue="daily" spacing={2}>
<ToggleGroupItem value="daily">Daily</ToggleGroupItem>
<ToggleGroupItem value="weekly">Weekly</ToggleGroupItem>
</ToggleGroup>
// Multi-selection.
<ToggleGroup type="multiple">
<ToggleGroupItem value="bold">Bold</ToggleGroupItem>
<ToggleGroupItem value="italic">Italic</ToggleGroupItem>
</ToggleGroup>
```
**Controlled single value:**
```tsx
// base — wrap/unwrap arrays.
const [value, setValue] = React.useState("normal")
<ToggleGroup value={[value]} onValueChange={(v) => setValue(v[0])}>
// radix — plain string.
const [value, setValue] = React.useState("normal")
<ToggleGroup type="single" value={value} onValueChange={setValue}>
```
---
## Slider
Base accepts a plain number for a single thumb. Radix always requires an array.
**Incorrect (base):**
```tsx
<Slider defaultValue={[50]} max={100} step={1} />
```
**Correct (base):**
```tsx
<Slider defaultValue={50} max={100} step={1} />
```
**Correct (radix):**
```tsx
<Slider defaultValue={[50]} max={100} step={1} />
```
Both use arrays for range sliders. Controlled `onValueChange` in base may need a cast:
```tsx
// base.
const [value, setValue] = React.useState([0.3, 0.7])
<Slider value={value} onValueChange={(v) => setValue(v as number[])} />
// radix.
const [value, setValue] = React.useState([0.3, 0.7])
<Slider value={value} onValueChange={setValue} />
```
---
## Accordion
Radix requires `type="single"` or `type="multiple"` and supports `collapsible`. `defaultValue` is a string. Base uses no `type` prop, uses `multiple` boolean, and `defaultValue` is always an array.
**Incorrect (base):**
```tsx
<Accordion type="single" collapsible defaultValue="item-1">
<AccordionItem value="item-1">...</AccordionItem>
</Accordion>
```
**Correct (base):**
```tsx
<Accordion defaultValue={["item-1"]}>
<AccordionItem value="item-1">...</AccordionItem>
</Accordion>
// Multi-select.
<Accordion multiple defaultValue={["item-1", "item-2"]}>
<AccordionItem value="item-1">...</AccordionItem>
<AccordionItem value="item-2">...</AccordionItem>
</Accordion>
```
**Correct (radix):**
```tsx
<Accordion type="single" collapsible defaultValue="item-1">
<AccordionItem value="item-1">...</AccordionItem>
</Accordion>
```
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# Component Composition
## Contents
- Items always inside their Group component
- Callouts use Alert
- Empty states use Empty component
- Toast notifications use sonner
- Choosing between overlay components
- Dialog, Sheet, and Drawer always need a Title
- Card structure
- Button has no isPending or isLoading prop
- TabsTrigger must be inside TabsList
- Avatar always needs AvatarFallback
- Use Separator instead of raw hr or border divs
- Use Skeleton for loading placeholders
- Use Badge instead of custom styled spans
---
## Items always inside their Group component
Never render items directly inside the content container.
**Incorrect:**
```tsx
<SelectContent>
<SelectItem value="apple">Apple</SelectItem>
<SelectItem value="banana">Banana</SelectItem>
</SelectContent>
```
**Correct:**
```tsx
<SelectContent>
<SelectGroup>
<SelectItem value="apple">Apple</SelectItem>
<SelectItem value="banana">Banana</SelectItem>
</SelectGroup>
</SelectContent>
```
This applies to all group-based components:
| Item | Group |
|------|-------|
| `SelectItem`, `SelectLabel` | `SelectGroup` |
| `DropdownMenuItem`, `DropdownMenuLabel`, `DropdownMenuSub` | `DropdownMenuGroup` |
| `MenubarItem` | `MenubarGroup` |
| `ContextMenuItem` | `ContextMenuGroup` |
| `CommandItem` | `CommandGroup` |
---
## Callouts use Alert
```tsx
<Alert>
<AlertTitle>Warning</AlertTitle>
<AlertDescription>Something needs attention.</AlertDescription>
</Alert>
```
---
## Empty states use Empty component
```tsx
<Empty>
<EmptyHeader>
<EmptyMedia variant="icon"><FolderIcon /></EmptyMedia>
<EmptyTitle>No projects yet</EmptyTitle>
<EmptyDescription>Get started by creating a new project.</EmptyDescription>
</EmptyHeader>
<EmptyContent>
<Button>Create Project</Button>
</EmptyContent>
</Empty>
```
---
## Toast notifications use sonner
```tsx
import { toast } from "sonner"
toast.success("Changes saved.")
toast.error("Something went wrong.")
toast("File deleted.", {
action: { label: "Undo", onClick: () => undoDelete() },
})
```
---
## Choosing between overlay components
| Use case | Component |
|----------|-----------|
| Focused task that requires input | `Dialog` |
| Destructive action confirmation | `AlertDialog` |
| Side panel with details or filters | `Sheet` |
| Mobile-first bottom panel | `Drawer` |
| Quick info on hover | `HoverCard` |
| Small contextual content on click | `Popover` |
---
## Dialog, Sheet, and Drawer always need a Title
`DialogTitle`, `SheetTitle`, `DrawerTitle` are required for accessibility. Use `className="sr-only"` if visually hidden.
```tsx
<DialogContent>
<DialogHeader>
<DialogTitle>Edit Profile</DialogTitle>
<DialogDescription>Update your profile.</DialogDescription>
</DialogHeader>
...
</DialogContent>
```
---
## Card structure
Use full composition — don't dump everything into `CardContent`:
```tsx
<Card>
<CardHeader>
<CardTitle>Team Members</CardTitle>
<CardDescription>Manage your team.</CardDescription>
</CardHeader>
<CardContent>...</CardContent>
<CardFooter>
<Button>Invite</Button>
</CardFooter>
</Card>
```
---
## Button has no isPending or isLoading prop
Compose with `Spinner` + `data-icon` + `disabled`:
```tsx
<Button disabled>
<Spinner data-icon="inline-start" />
Saving...
</Button>
```
---
## TabsTrigger must be inside TabsList
Never render `TabsTrigger` directly inside `Tabs` — always wrap in `TabsList`:
```tsx
<Tabs defaultValue="account">
<TabsList>
<TabsTrigger value="account">Account</TabsTrigger>
<TabsTrigger value="password">Password</TabsTrigger>
</TabsList>
<TabsContent value="account">...</TabsContent>
</Tabs>
```
---
## Avatar always needs AvatarFallback
Always include `AvatarFallback` for when the image fails to load:
```tsx
<Avatar>
<AvatarImage src="/avatar.png" alt="User" />
<AvatarFallback>JD</AvatarFallback>
</Avatar>
```
---
## Use existing components instead of custom markup
| Instead of | Use |
|---|---|
| `<hr>` or `<div className="border-t">` | `<Separator />` |
| `<div className="animate-pulse">` with styled divs | `<Skeleton className="h-4 w-3/4" />` |
| `<span className="rounded-full bg-green-100 ...">` | `<Badge variant="secondary">` |
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# Forms & Inputs
## Contents
- Forms use FieldGroup + Field
- InputGroup requires InputGroupInput/InputGroupTextarea
- Buttons inside inputs use InputGroup + InputGroupAddon
- Option sets (27 choices) use ToggleGroup
- FieldSet + FieldLegend for grouping related fields
- Field validation and disabled states
---
## Forms use FieldGroup + Field
Always use `FieldGroup` + `Field` — never raw `div` with `space-y-*`:
```tsx
<FieldGroup>
<Field>
<FieldLabel htmlFor="email">Email</FieldLabel>
<Input id="email" type="email" />
</Field>
<Field>
<FieldLabel htmlFor="password">Password</FieldLabel>
<Input id="password" type="password" />
</Field>
</FieldGroup>
```
Use `Field orientation="horizontal"` for settings pages. Use `FieldLabel className="sr-only"` for visually hidden labels.
**Choosing form controls:**
- Simple text input → `Input`
- Dropdown with predefined options → `Select`
- Searchable dropdown → `Combobox`
- Native HTML select (no JS) → `native-select`
- Boolean toggle → `Switch` (for settings) or `Checkbox` (for forms)
- Single choice from few options → `RadioGroup`
- Toggle between 25 options → `ToggleGroup` + `ToggleGroupItem`
- OTP/verification code → `InputOTP`
- Multi-line text → `Textarea`
---
## InputGroup requires InputGroupInput/InputGroupTextarea
Never use raw `Input` or `Textarea` inside an `InputGroup`.
**Incorrect:**
```tsx
<InputGroup>
<Input placeholder="Search..." />
</InputGroup>
```
**Correct:**
```tsx
import { InputGroup, InputGroupInput } from "@/components/ui/input-group"
<InputGroup>
<InputGroupInput placeholder="Search..." />
</InputGroup>
```
---
## Buttons inside inputs use InputGroup + InputGroupAddon
Never place a `Button` directly inside or adjacent to an `Input` with custom positioning.
**Incorrect:**
```tsx
<div className="relative">
<Input placeholder="Search..." className="pr-10" />
<Button className="absolute right-0 top-0" size="icon">
<SearchIcon />
</Button>
</div>
```
**Correct:**
```tsx
import { InputGroup, InputGroupInput, InputGroupAddon } from "@/components/ui/input-group"
<InputGroup>
<InputGroupInput placeholder="Search..." />
<InputGroupAddon>
<Button size="icon">
<SearchIcon data-icon="inline-start" />
</Button>
</InputGroupAddon>
</InputGroup>
```
---
## Option sets (27 choices) use ToggleGroup
Don't manually loop `Button` components with active state.
**Incorrect:**
```tsx
const [selected, setSelected] = useState("daily")
<div className="flex gap-2">
{["daily", "weekly", "monthly"].map((option) => (
<Button
key={option}
variant={selected === option ? "default" : "outline"}
onClick={() => setSelected(option)}
>
{option}
</Button>
))}
</div>
```
**Correct:**
```tsx
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group"
<ToggleGroup spacing={2}>
<ToggleGroupItem value="daily">Daily</ToggleGroupItem>
<ToggleGroupItem value="weekly">Weekly</ToggleGroupItem>
<ToggleGroupItem value="monthly">Monthly</ToggleGroupItem>
</ToggleGroup>
```
Combine with `Field` for labelled toggle groups:
```tsx
<Field orientation="horizontal">
<FieldTitle id="theme-label">Theme</FieldTitle>
<ToggleGroup aria-labelledby="theme-label" spacing={2}>
<ToggleGroupItem value="light">Light</ToggleGroupItem>
<ToggleGroupItem value="dark">Dark</ToggleGroupItem>
<ToggleGroupItem value="system">System</ToggleGroupItem>
</ToggleGroup>
</Field>
```
> **Note:** `defaultValue` and `type`/`multiple` props differ between base and radix. See [base-vs-radix.md](./base-vs-radix.md#togglegroup).
---
## FieldSet + FieldLegend for grouping related fields
Use `FieldSet` + `FieldLegend` for related checkboxes, radios, or switches — not `div` with a heading:
```tsx
<FieldSet>
<FieldLegend variant="label">Preferences</FieldLegend>
<FieldDescription>Select all that apply.</FieldDescription>
<FieldGroup className="gap-3">
<Field orientation="horizontal">
<Checkbox id="dark" />
<FieldLabel htmlFor="dark" className="font-normal">Dark mode</FieldLabel>
</Field>
</FieldGroup>
</FieldSet>
```
---
## Field validation and disabled states
Both attributes are needed — `data-invalid`/`data-disabled` styles the field (label, description), while `aria-invalid`/`disabled` styles the control.
```tsx
// Invalid.
<Field data-invalid>
<FieldLabel htmlFor="email">Email</FieldLabel>
<Input id="email" aria-invalid />
<FieldDescription>Invalid email address.</FieldDescription>
</Field>
// Disabled.
<Field data-disabled>
<FieldLabel htmlFor="email">Email</FieldLabel>
<Input id="email" disabled />
</Field>
```
Works for all controls: `Input`, `Textarea`, `Select`, `Checkbox`, `RadioGroupItem`, `Switch`, `Slider`, `NativeSelect`, `InputOTP`.
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# Icons
**Always use the project's configured `iconLibrary` for imports.** Check the `iconLibrary` field from project context: `lucide``lucide-react`, `tabler``@tabler/icons-react`, etc. Never assume `lucide-react`.
---
## Icons in Button use data-icon attribute
Add `data-icon="inline-start"` (prefix) or `data-icon="inline-end"` (suffix) to the icon. No sizing classes on the icon.
**Incorrect:**
```tsx
<Button>
<SearchIcon className="mr-2 size-4" />
Search
</Button>
```
**Correct:**
```tsx
<Button>
<SearchIcon data-icon="inline-start"/>
Search
</Button>
<Button>
Next
<ArrowRightIcon data-icon="inline-end"/>
</Button>
```
---
## No sizing classes on icons inside components
Components handle icon sizing via CSS. Don't add `size-4`, `w-4 h-4`, or other sizing classes to icons inside `Button`, `DropdownMenuItem`, `Alert`, `Sidebar*`, or other shadcn components. Unless the user explicitly asks for custom icon sizes.
**Incorrect:**
```tsx
<Button>
<SearchIcon className="size-4" data-icon="inline-start" />
Search
</Button>
<DropdownMenuItem>
<SettingsIcon className="mr-2 size-4" />
Settings
</DropdownMenuItem>
```
**Correct:**
```tsx
<Button>
<SearchIcon data-icon="inline-start" />
Search
</Button>
<DropdownMenuItem>
<SettingsIcon />
Settings
</DropdownMenuItem>
```
---
## Pass icons as component objects, not string keys
Use `icon={CheckIcon}`, not a string key to a lookup map.
**Incorrect:**
```tsx
const iconMap = {
check: CheckIcon,
alert: AlertIcon,
}
function StatusBadge({ icon }: { icon: string }) {
const Icon = iconMap[icon]
return <Icon />
}
<StatusBadge icon="check" />
```
**Correct:**
```tsx
// Import from the project's configured iconLibrary (e.g. lucide-react, @tabler/icons-react).
import { CheckIcon } from "lucide-react"
function StatusBadge({ icon: Icon }: { icon: React.ComponentType }) {
return <Icon />
}
<StatusBadge icon={CheckIcon} />
```
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# Styling & Customization
See [customization.md](../customization.md) for theming, CSS variables, and adding custom colors.
## Contents
- Semantic colors
- Built-in variants first
- className for layout only
- No space-x-* / space-y-*
- Prefer size-* over w-* h-* when equal
- Prefer truncate shorthand
- No manual dark: color overrides
- Use cn() for conditional classes
- No manual z-index on overlay components
---
## Semantic colors
**Incorrect:**
```tsx
<div className="bg-blue-500 text-white">
<p className="text-gray-600">Secondary text</p>
</div>
```
**Correct:**
```tsx
<div className="bg-primary text-primary-foreground">
<p className="text-muted-foreground">Secondary text</p>
</div>
```
---
## No raw color values for status/state indicators
For positive, negative, or status indicators, use Badge variants, semantic tokens like `text-destructive`, or define custom CSS variables — don't reach for raw Tailwind colors.
**Incorrect:**
```tsx
<span className="text-emerald-600">+20.1%</span>
<span className="text-green-500">Active</span>
<span className="text-red-600">-3.2%</span>
```
**Correct:**
```tsx
<Badge variant="secondary">+20.1%</Badge>
<Badge>Active</Badge>
<span className="text-destructive">-3.2%</span>
```
If you need a success/positive color that doesn't exist as a semantic token, use a Badge variant or ask the user about adding a custom CSS variable to the theme (see [customization.md](../customization.md)).
---
## Built-in variants first
**Incorrect:**
```tsx
<Button className="border border-input bg-transparent hover:bg-accent">
Click me
</Button>
```
**Correct:**
```tsx
<Button variant="outline">Click me</Button>
```
---
## className for layout only
Use `className` for layout (e.g. `max-w-md`, `mx-auto`, `mt-4`), **not** for overriding component colors or typography. To change colors, use semantic tokens, built-in variants, or CSS variables.
**Incorrect:**
```tsx
<Card className="bg-blue-100 text-blue-900 font-bold">
<CardContent>Dashboard</CardContent>
</Card>
```
**Correct:**
```tsx
<Card className="max-w-md mx-auto">
<CardContent>Dashboard</CardContent>
</Card>
```
To customize a component's appearance, prefer these approaches in order:
1. **Built-in variants**`variant="outline"`, `variant="destructive"`, etc.
2. **Semantic color tokens**`bg-primary`, `text-muted-foreground`.
3. **CSS variables** — define custom colors in the global CSS file (see [customization.md](../customization.md)).
---
## No space-x-* / space-y-*
Use `gap-*` instead. `space-y-4``flex flex-col gap-4`. `space-x-2``flex gap-2`.
```tsx
<div className="flex flex-col gap-4">
<Input />
<Input />
<Button>Submit</Button>
</div>
```
---
## Prefer size-* over w-* h-* when equal
`size-10` not `w-10 h-10`. Applies to icons, avatars, skeletons, etc.
---
## Prefer truncate shorthand
`truncate` not `overflow-hidden text-ellipsis whitespace-nowrap`.
---
## No manual dark: color overrides
Use semantic tokens — they handle light/dark via CSS variables. `bg-background text-foreground` not `bg-white dark:bg-gray-950`.
---
## Use cn() for conditional classes
Use the `cn()` utility from the project for conditional or merged class names. Don't write manual ternaries in className strings.
**Incorrect:**
```tsx
<div className={`flex items-center ${isActive ? "bg-primary text-primary-foreground" : "bg-muted"}`}>
```
**Correct:**
```tsx
import { cn } from "@/lib/utils"
<div className={cn("flex items-center", isActive ? "bg-primary text-primary-foreground" : "bg-muted")}>
```
---
## No manual z-index on overlay components
`Dialog`, `Sheet`, `Drawer`, `AlertDialog`, `DropdownMenu`, `Popover`, `Tooltip`, `HoverCard` handle their own stacking. Never add `z-50` or `z-[999]`.
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---
name: reui
description: Use the ReUI registry from your AI agent - find, install, and correctly use ReUI components (the 17 free building blocks like data-grid, kanban, filters), their free examples, premium blocks, and Motion Icons. Applies in any project using ReUI, the @reui registry, REUI_LICENSE_KEY, or any shadcn project where the user asks for premium blocks, data grids, kanban boards, dashboards, or full pages. Pairs with the free ReUI MCP server for live, scored registry search and inline component APIs.
user-invocable: false
allowed-tools: Bash(npx shadcn@latest *), Bash(pnpm dlx shadcn@latest *), Bash(bunx --bun shadcn@latest *)
---
> **ReUI skill version `42d70dcc3d`.** If the ReUI MCP's `get_agent_skill` reports a newer `version`, re-run the ReUI installer (see `get_agent_skill` -> `install.recommended`) to update this skill. Cloud/tools-only agents have no local file and always read the latest - they can ignore this.
# ReUI for Agents
ReUI is a shadcn-compatible registry. It ships four things you **reuse** - never redesign:
- **components** - the 17 ReUI building blocks with real APIs: `data-grid`, `kanban`, `filters`, `date-selector`, `tree`, `stepper`, ... (free)
- **examples** - free `c-*` single-pattern use-cases of a component (`c-kanban-1`); install one and read it to see exact composition
- **blocks** - premium full-page sections that compose components (`data-grid-2`, `pricing-page-1`); Pro or Ultimate license at install
- **icons** - Motion Icons in 4 styles, static + hover-animated variants; Ultimate license at install
The skill is free and this MCP is free to use; it just needs a ReUI account. On first use your agent opens a browser "Sign in with ReUI" prompt (a free account is created if you don't have one). Free covers components and examples with a daily request allowance; a Pro or Ultimate license unlocks premium blocks and Motion Icons and removes the limit (see [rules/registry.md](./rules/registry.md)). The same account and skill work in every agent and service the MCP connects to - this skill is agent-agnostic.
Skill + MCP are a team: this skill is the workflow (how to find, install, read the API, and adapt by reuse); the MCP is the live data and the hands (search, get_component, install commands). Your job: find the right item, install it with the shadcn CLI, read its real API, and **adapt by reuse** - wire real data and theme it; do not hand-roll or restyle what ReUI already provides. This skill **layers on the shadcn skill**: follow that for generic rules (spacing, `cn()`, semantic colors, forms); follow this for everything ReUI-specific.
## The core loop (MCP-native)
1. **Find** - call the ReUI MCP `search` tool with the user's intent. It returns a ranked, scored list across components/examples/blocks/icons, each with an `install` command, `previewUrl`, `docsUrl`, and `componentsUsed`. Pass hints (`type`, `component`, `category`, `features`, `free`) when you can infer them.
2. **Install** - run the returned command non-interactively (`npx shadcn@latest add @reui/<name> --yes`). The CLI resolves deps, aliases, and the base/style from `components.json`. See [cli.md](./rules/cli.md).
3. **Read the API (on your base)** - first note your base from `components.json` -> `style` (`base-nova` -> Base UI, `radix-nova` -> Radix UI). For each component an item uses, call `get_component(name)` and read its **inline `api`** (no web fetch); then `get_examples(name)` to install a worked example and copy its composition - the installed files are already in your base. Whenever you work with a component's API, also **share its `docsUrl`** (the primitive's API documentation page) with the user so they have the full reference. See [components.md](./rules/components.md).
4. **Adapt (reuse-first)** - swap demo data for real data, fix icon imports, align tokens. Do not redesign. See [adapting.md](./rules/adapting.md).
**Always show the preview.** Every item a tool returns carries a `previewUrl` (a live preview page). Whenever you list, recommend, or present ReUI items to the user - blocks, components, examples, or icons, whether from `search`, `search_icons`, `list_components`, `compose_page`, or any getter - include each item's `previewUrl` so they can SEE it before installing. Blocks and examples open an individual live preview; icons and components link to their live category/component page. Never present an item without its preview link.
If the ReUI MCP is not configured, fall back to `npx shadcn@latest search @reui -q "..."` then `add` - but the MCP gives scored matches + inline APIs; prefer it.
## Commands
Run ReUI as explicit slash commands (via the ReUI MCP) **or** just ask in plain language - both run the same workflow.
| Command | Invoke | Does |
| ----------- | ------------------------------ | ------------------------------------------------------------------------------------------------------------------ |
| **build** | `/mcp__reui__build <what>` | Compose a page/section/feature from ReUI: plan → install → read API → adapt → craft → audit. |
| **add** | `/mcp__reui__add <item>` | Find & install one component/example/block/icon and wire it in. |
| **fix** | `/mcp__reui__fix [target]` | Diagnose & fix ReUI usage: wrong/undocumented props, base/radix mismatch, missing states, a11y/scroll. |
| **improve** | `/mcp__reui__improve [target]` | Refine + extend existing ReUI UI to a production-exceptional bar (hierarchy, density, states, responsive, motion). |
Invocation differs slightly per agent (`/mcp__reui__build` in Claude Code/Cursor/Windsurf, `/mcp.reui.build` in VS Code). No command surface? Just describe what you want - this skill drives the identical loop.
## When to reach for ReUI vs plain shadcn
| Need | Reach for |
| -------------------------------------------------------------------- | ------------------------------------------------------------------------- |
| A full page or section (dashboard, billing, auth, pricing, settings) | `compose_page` first (plans sections + best blocks), then ReUI **blocks** |
| A data table with sorting/filtering/pagination/virtualization | the **data-grid** component (never hand-roll a `<table>`) |
| A drag-and-drop board | the **kanban** component |
| Advanced column filtering, date range, tree, stepper, ... | the matching ReUI **component** |
| A single generic control already in shadcn (Button, Dialog, Select) | plain **shadcn** |
## Detailed references
- [rules/registry.md](./rules/registry.md) - the four types, the @reui registry, base/radix, free vs premium + license
- [rules/workflow.md](./rules/workflow.md) - the find -> install -> read-API -> adapt loop (most important)
- [rules/components.md](./rules/components.md) - the 17 components, the data-grid contract, base vs radix
- [rules/adapting.md](./rules/adapting.md) - reuse-first: preserve the design (no over-customizing), reuse examples + a block's own elements, real data, don't invent APIs
- [rules/craft.md](./rules/craft.md) - make it exceptional: point of view, hierarchy, density, states, responsive, motion, the bar
- [rules/quality.md](./rules/quality.md) - security, accessibility, and scroll gates (the done gate)
- [rules/styling.md](./rules/styling.md) - ReUI extended tokens, theme adaptation, density
- [rules/icons.md](./rules/icons.md) - portable icons, swapping imports, Motion Icons (static + animated)
- [tools.md](./tools.md) - the ReUI MCP: golden path, the 19 tools, token rules, result shapes, errors
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# Adapting installed ReUI code (reuse-first, no AI slop)
ReUI items ship production-quality. Your job is to **adapt by reuse** - wire real data and fit the app - not to redesign or hand-roll. The output should look like ReUI built it for this product.
## Preserve the design - don't over-customize
The design IS the product. A ReUI block/component encodes senior-designer decisions: spacing, hierarchy, density, color treatment, and component choices. The fastest way to turn a premium block back into generic AI slop is to "improve" its look - so don't.
- Change **data, copy, and props**; keep the **structure and styling** it ships with. Make the **smallest** change that wires the real data. If your diff touches `className` / JSX structure more than data / props, you are over-customizing - stop and reuse.
- Don't swap ReUI components for hand-rolled ones, restructure the layout, re-skin spacing / radius / colors, or add decorative chrome. Let the installed components carry the default spacing, radius, sizing, icon rhythm, density, and state styling; add custom Tailwind only when a component genuinely lacks a contract you need.
- Want a different look? `search` for a block whose design already fits and reuse that - don't restyle this one into a new design.
## Reuse the parts: examples and the block's own elements
- **Examples are building parts.** A free `c-*` example is a correct, single-pattern composition you can reuse. Before composing from scratch, `get_examples(component)`, install the closest one, and reuse its wiring - assemble UI from examples instead of hand-rolling what an example already shows.
- **Reuse a block's own elements.** Need more rows, cards, items, or sections than ship by default? Repeat the block's **existing** element by mapping real data through the same markup - never invent parallel markup that drifts from its design. Need a variant (empty / loading / expanded)? Derive it from an element the block already has.
## Don't invent (read, don't guess)
- Never write a prop, variant value, import path, or `@reui/...` name you didn't read in a component's inline `api`, an installed example, or a `search` result. If you didn't see it, treat it as nonexistent - call `get_component` / `get_examples` / `search` first, or run the MCP `validate_usage` tool to check planned names + props against the docs before writing code.
- If a getter returns `found: false` or `search` returns nothing, say so and fall back (plain shadcn, or ask) - never fabricate an install command or an API.
## What to change vs leave alone
- **Change:** the item's own data, copy, props, and layout to fit the app.
- **Leave alone:** installed component files, hooks, and the shared theme - do not edit vendored ReUI internals; change behavior through props and the documented API.
- Blocks are **portable React** - no `next/link`, `next/image`, or other framework-runtime imports inside them. Keep them portable.
## Demo data -> real data
- Replace every placeholder with the user's real data. Model it as **typed data structures** and **map over arrays** - never duplicate JSX per row/card. Keep small block-specific formatters next to the data.
- Wire the real source (columns, fields, fetch). For `data-grid`, implement the server fetch contract if the user needs server-side data.
- **Type from the component API, derive during render.** Type domain state through the component's own types - e.g. map status to `BadgeProps["variant"]` via a typed `Record<Status, …>` - instead of stringly-typed values. Compute view state during render; don't mirror derived data into `useState`/`useEffect`.
- **Adapt on the right base.** Use the API for the project's base (Base UI vs Radix - see [components.md](./components.md)); the installed files are already base-correct, so reuse their shape rather than translating from memory.
## Believable content (no AI tells)
- Use realistic labels, counts, timestamps, and statuses that map to a real workflow.
- No decorative buttons, fake tabs, meaningless toggles, equal-weight card walls, empty gradients, ornamental icons, or generic SaaS filler. Every element should do something.
## Operational surfaces (settings / profile / admin)
Pick ONE archetype and keep the family consistent: a vertical rail (3-6 sections), horizontal tabs (5-8), or a frame/stack. Prefer `frame` for tool-like surfaces, a card for profile-like ones. Don't mix archetypes in one surface.
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# CLI: registry setup, license, non-interactive install
## Registry setup (one-time, per project)
Free items (the 17 components and all `c-*` examples) need only the plain string registry in `components.json`:
```json
{ "registries": { "@reui": "https://reui.io/r/{style}/{name}.json" } }
```
Premium items (blocks; Motion Icons and templates) require a ReUI license at install:
1. Add the key to `.env.local`:
```bash
REUI_LICENSE_KEY=your-license-key
```
2. Switch `components.json` to the authenticated object form:
```json
{
"registries": {
"@reui": {
"url": "https://reui.io/r/{style}/{name}.json",
"headers": { "Authorization": "Bearer ${REUI_LICENSE_KEY}" }
}
}
}
```
The shadcn CLI expands `${REUI_LICENSE_KEY}` from `.env.local` inside `components.json`, but an MCP client config never expands variables, so a ReUI MCP server config must carry the raw token instead (for example `reui_pat_your_token_here`).
The MCP `get_project_context` tool returns the right config. Full guide: https://reui.io/docs/registry
## Installing
Use the project's package runner (check `packageManager`):
```bash
npx shadcn@latest add @reui/<name> --yes # npm
pnpm dlx shadcn@latest add @reui/<name> --yes # pnpm
bunx --bun shadcn@latest add @reui/<name> --yes # bun
```
`--yes` skips confirmation prompts. The CLI auto-detects the package manager from the lockfile (there is no `--package-manager` flag). It also resolves the correct base+style variant from `components.json`, so do not pass a style.
## Handling prompts and conflicts
- **Always pass `--yes`** so the CLI does not block on confirmation prompts.
- **Do NOT pass `--overwrite` by default.** If the CLI reports an existing file, read the output and resolve deliberately: install under a different name, adjust the path, or ask the user. Only use `--overwrite` when the user explicitly wants to replace a file.
- **Preview first when touching an existing project**: `npx shadcn@latest add @reui/<name> --dry-run` shows what would change; `--diff <file>` shows a specific file's diff. Use these before overwriting.
- Run from the **project root** so `components.json` and `.env.local` are found.
## Free vs premium boundary
- Public, no key: `c-*` examples and the 17 components (`@reui/data-grid`, `@reui/badge`, ...) that those examples depend on.
- Key required at install: blocks (`@reui/<category>-N`) need a Pro or Ultimate license; Motion Icons (`@reui/icons/...`) and templates need Ultimate.
If an install 401/403s, the license key is missing, invalid, or the plan does not cover that resource (blocks: Pro or higher; icons and templates: Ultimate). Point the user to https://reui.io/account (their key) or https://reui.io/pricing (upgrade).
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# ReUI components
The 19 ReUI building blocks: `alert`, `autocomplete`, `badge`, `data-grid`, `date-selector`, `event-calendar`, `filters`, `frame`, `gantt`, `icon-stack`, `kanban`, `number-field`, `phone-input`, `rating`, `scrollspy`, `sortable`, `stepper`, `timeline`, `tree`. Examples and blocks are composed from these.
**Rule one: never guess a component's API. Read it first.** Call **`get_component(name)`** for its inline `api` (props + usage, no web fetch), and **share the result's `docsUrl`** (the component's API documentation page) with the user whenever you work with that component's API, so they have the full reference (the `/llms.txt` index is a further fallback). Then call **`get_examples(name)`** to install a worked example and copy real composition. The contracts below are first-try orientation (required props, composition shape, the one gotcha); the inline `api` is the full reference. No single block fits? Compose: search the components you need, read each `get_component`, install a `get_examples` example per component, and adapt.
## data-grid (the flagship - read its API every time)
`data-grid` wraps TanStack Table v8. It is NOT a styled `<table>` and does NOT take `data`/`columns` props directly. The contract:
- Build a TanStack table instance with `useReactTable(...)` (columns, data, the feature models you need: sorting, pagination, row selection).
- Pass that instance to `<DataGrid table={table} recordCount={total}>`.
- Compose the body with `DataGridTable` inside `DataGrid`, and enable features through `tableLayout` (e.g. `{ headerSticky: true, columnsResizable: true }`), not ad-hoc classes.
- Server-side data uses the documented fetch shape (`recordCount` is the total for pagination).
```tsx
const table = useReactTable({
data,
columns,
getCoreRowModel: getCoreRowModel(),
// add sorting/pagination/selection models per the API
})
<DataGrid table={table} recordCount={data.length}>
<DataGridTable />
</DataGrid>
```
Common mistakes:
- **Incorrect:** `<DataGrid data={rows} columns={cols} />` - these props do not exist. **Correct:** build a `useReactTable` instance and pass `table={table}` + `recordCount`.
- **Incorrect:** a raw `<table>` / hand-rolled pagination. **Correct:** use `data-grid`; read its API for sticky header, pagination, virtualization, row selection.
- **Incorrect:** styling rows/cells with arbitrary classes. **Correct:** drive layout via `tableLayout` and the documented `ColumnMeta` (e.g. `cellClassName`, `headerTitle`).
## event-calendar
**Required:** events via `events`/`onEventsChange` (controlled) or `defaultEvents` (uncontrolled), plus a height on the root.
**Shape:**
```tsx
<EventCalendar defaultEvents={events} defaultView="month" className="h-[560px]">
<EventCalendarNav />
<EventCalendarContent />
</EventCalendar>
```
**Gotcha:** headless-first: `EventCalendarContent` renders the active view (month/week/day/days/agenda; a resource view activates when `resources` is passed) - there is no per-view JSX to compose. Events are `{ id, title, start, end (exclusive), allDay?, color?, recurrence?, resourceId? }`. Mutations flow through `onEventUpdate`/`canDropEvent` (return `false` to reject); the root needs an explicit height because it is a min-h-0 flex column.
## gantt
**Required:** `resources` (the left tree) plus bars via `events`/`defaultEvents` attached by `resourceId`.
**Shape:**
```tsx
<Gantt defaultEvents={bars} resources={tasks} defaultScale="month" className="h-[480px]">
<GanttNav />
<GanttView />
</Gantt>
```
**Gotcha:** bars move along the time axis only (never across rows) and are all-day spans with exclusive `end`; `progress` is 0-100. Scales are `day | week | month | quarter | year`. Zoom control, infinite scroll, summary rollups, and row checkboxes are ON by default - turn off what you do not need. Same `onEventUpdate`/`canDropEvent` commit pipeline as `event-calendar`; the root needs an explicit height.
## kanban
**Required:** `value` (`Record<string, T[]>`), `onValueChange`, `getItemValue`
**Shape:**
```tsx
<Kanban value={cols} onValueChange={setCols} getItemValue={(i) => i.id}>
<KanbanBoard>
{Object.entries(cols).map(([id, items]) => (
<KanbanColumn key={id} value={id}>
<KanbanColumnHandle><h3>{id}</h3></KanbanColumnHandle>
<KanbanColumnContent value={id}>
{items.map((i) => (
<KanbanItem key={i.id} value={i.id}>
<KanbanItemHandle>{i.title}</KanbanItemHandle>
</KanbanItem>
))}
</KanbanColumnContent>
</KanbanColumn>
))}
</KanbanBoard>
<KanbanOverlay><div className="bg-muted size-full rounded-md" /></KanbanOverlay>
</Kanban>
```
**Gotcha:** state is `Record<columnId, T[]>`. Each `KanbanColumnContent value` must match its parent `KanbanColumn value`. Omit `KanbanOverlay` and the drag preview silently breaks.
## sortable
**Required:** `value` (`T[]`), `onValueChange`, `getItemValue`
**Shape:**
```tsx
<Sortable value={items} onValueChange={setItems} getItemValue={(i) => i.id}>
{items.map((i) => (
<SortableItem key={i.id} value={i.id}>
<SortableItemHandle><GripVertical /></SortableItemHandle>
{i.label}
</SortableItem>
))}
</Sortable>
```
**Gotcha:** a flat 1D reorder list (not columns - that is `kanban`). `getItemValue` must return a stable, unique string. Pass `layout="grid"` or `layout="nested"` for non-list layouts.
## filters
**Required:** `filters` (`Filter[]`), `fields` (`FilterFieldConfig[]`), `onChange`
**Shape:**
```tsx
const [filters, setFilters] = useState<Filter[]>([
createFilter("priority", "is_any_of", ["low"]),
])
const fields: FilterFieldConfig[] = [
{ key: "priority", label: "Priority", type: "multiselect",
options: [{ value: "low", label: "Low" }, { value: "high", label: "High" }] },
]
<Filters filters={filters} fields={fields} onChange={setFilters} />
```
**Gotcha:** always build initial filters with `createFilter(field, operator, values)` - it generates the required `id`. Never hand-construct a `Filter` object. Pairs naturally with `data-grid`.
## date-selector
**Required:** none, but wire `onChange` to capture the value.
**Shape:**
```tsx
const [value, setValue] = useState<DateSelectorValue | undefined>()
<DateSelector value={value} onChange={setValue} label="Due date" />
```
**Gotcha:** the value is a structured `DateSelectorValue` (period / operator / start+end dates), NOT a `Date` - never pass a raw `Date`. Use `allowRange={false}` to lock single-date picking. Read `get_component("date-selector")` for the value shape.
## tree
**Required:** `tree` (a `@headless-tree/core` instance you construct)
**Shape:**
```tsx
<Tree tree={tree}>
{tree.getItems().map((item) => (
<TreeItem key={item.getId()} item={item}>
<TreeItemLabel />
</TreeItem>
))}
</Tree>
```
**Gotcha:** `Tree` is a styled shell - it takes a headless-tree instance via `tree`, NOT `data`/`items` props. Build the instance with `@headless-tree/react`. External API: https://headless-tree.lukasbach.com/
## stepper
**Required:** `StepperItem step` (number), `StepperContent value` (number)
**Shape:**
```tsx
<Stepper defaultValue={1}>
<StepperNav>
<StepperItem step={1}>
<StepperTrigger><StepperIndicator>1</StepperIndicator></StepperTrigger>
<StepperSeparator />
</StepperItem>
<StepperItem step={2}>
<StepperTrigger><StepperIndicator>2</StepperIndicator></StepperTrigger>
</StepperItem>
</StepperNav>
<StepperPanel>
<StepperContent value={1}>Step 1 content</StepperContent>
<StepperContent value={2}>Step 2 content</StepperContent>
</StepperPanel>
</Stepper>
```
**Gotcha:** steps are 1-indexed. Without `StepperPanel` + `StepperContent` you render the nav trail but no body. Put `StepperSeparator` in every `StepperItem` except the last.
## timeline
**Required:** `TimelineItem step` (number)
**Shape:**
```tsx
<Timeline>
<TimelineItem step={1}>
<TimelineHeader>
<TimelineDate>March 2024</TimelineDate>
<TimelineTitle>Project initialized</TimelineTitle>
</TimelineHeader>
<TimelineIndicator />
<TimelineSeparator />
<TimelineContent>Repo and architecture set up.</TimelineContent>
</TimelineItem>
</Timeline>
```
**Gotcha:** each item needs a unique `step`. `orientation` is `"vertical"` (default) or `"horizontal"`. This is a static event display, not interactive like `stepper`.
## autocomplete
**Required:** `items` (array; each item has at least `value`)
**Shape:**
```tsx
<Autocomplete items={items}>
<AutocompleteInput placeholder="Search..." />
<AutocompleteContent>
<AutocompleteEmpty>No results found.</AutocompleteEmpty>
<AutocompleteList>
{(item) => (
<AutocompleteItem key={item.value} value={item}>{item.label}</AutocompleteItem>
)}
</AutocompleteList>
</AutocompleteContent>
</Autocomplete>
```
**Gotcha:** `AutocompleteList` takes a render-prop `(item) => ReactNode`, NOT a mapped array of children. External API: https://base-ui.com/react/components/autocomplete
## phone-input
**Required:** none, but wire `onChange`.
**Shape:**
```tsx
<PhoneInput placeholder="Enter phone number" defaultCountry="US" value={value} onChange={setValue} />
```
**Gotcha:** `value`/`onChange` use an E.164 string (e.g. `"+14155551234"`), not a display-formatted string; `onChange` can fire `undefined`. `defaultCountry` is a 2-letter ISO code. Wraps `react-phone-number-input`.
## number-field
**Required:** wrap the controls in `NumberFieldGroup`.
**Shape:**
```tsx
<NumberField defaultValue={0}>
<NumberFieldScrubArea label="Quantity" />
<NumberFieldGroup>
<NumberFieldDecrement />
<NumberFieldInput />
<NumberFieldIncrement />
</NumberFieldGroup>
</NumberField>
```
**Gotcha:** import from `@/components/ui/number-field`. The accessible label goes on `NumberFieldScrubArea`, not `NumberField`. External API: https://base-ui.com/react/components/number-field
## rating
**Required:** `rating` (number)
**Shape:**
```tsx
<Rating rating={4.5} showValue editable onRatingChange={setRating} />
```
**Gotcha:** supports decimals (partial stars). Pass `editable` + `onRatingChange` for interactive input; omit both for a read-only display.
## scrollspy
**Required:** `targetRef` (the scroll container ref)
**Shape:**
```tsx
<Scrollspy targetRef={containerRef}>
<a href="#s1" data-scrollspy-anchor="s1">Section 1</a>
<a href="#s2" data-scrollspy-anchor="s2">Section 2</a>
</Scrollspy>
<div ref={containerRef}>
<div id="s1">...</div>
<div id="s2">...</div>
</div>
```
**Gotcha:** each link's `data-scrollspy-anchor` must match a section `id`. `targetRef` is the scrollable container (defaults to the window).
## frame
**Required:** `Frame` > `FramePanel`
**Shape:**
```tsx
<Frame>
<FramePanel>
<FrameHeader>
<FrameTitle>Title</FrameTitle>
<FrameDescription>Description</FrameDescription>
</FrameHeader>
<div className="p-5">Content</div>
<FrameFooter>Footer</FrameFooter>
</FramePanel>
</Frame>
```
**Gotcha:** a structured card shell for tool-like surfaces. `stacked` connects multiple panels with shared borders; `dense` removes panel padding; radius via the `--frame-radius` CSS variable.
## icon-stack
**Required:** one child icon
**Shape:**
```tsx
<IconStack aria-hidden="true">
<InboxIcon className="size-4" />
</IconStack>
```
**Gotcha:** isometric layered artwork for empty states and illustrations; style the inner icon via its own `className`. Mark purely decorative stacks `aria-hidden="true"` and keep the real label in surrounding copy.
## alert
**Required:** `Alert` > `AlertTitle`
**Shape:**
```tsx
<Alert variant="success">
<ShieldCheckIcon />
<AlertTitle>Security update</AlertTitle>
<AlertDescription>Enable two-factor authentication.</AlertDescription>
<AlertAction><Button size="xs">Update</Button></AlertAction>
</Alert>
```
**Gotcha:** shadcn-compatible API. `variant`: `default | destructive | info | success | warning | invert`. The non-default variants use ReUI extended color tokens (`--success`/`--info`/`--warning`/`--invert`), which the install adds. Defer generic alert rules to the shadcn skill.
## badge
**Required:** none (text child).
**Shape:**
```tsx
<Badge variant="success-light" size="sm">Success</Badge>
<Badge variant="outline" radius="full">Pill</Badge>
```
**Gotcha:** shadcn-compatible. Rich `variant` set (solid, `-outline`, `-light` per color), `size` `xs..xl`, `radius` `default | full`. Like `alert`, the color variants rely on ReUI extended tokens. Prefer `Badge` variants over raw color classes for statuses.
## base vs radix - write for the project's base
ReUI ships every component in two builds: `base` (Base UI) and `radix` (Radix UI). The install command and name are identical, and the CLI installs the build matching the project. But you must write/adapt code against the **right base**, because their APIs differ.
**Detect the base first.** Read `components.json` -> `style` and take the segment before the first `-`:
- `"style": "base-nova"` -> **Base UI**
- `"style": "radix-nova"` -> **Radix UI**
**Then use that base's API.** The deltas mirror shadcn's base-vs-radix split:
- Slot/composition: Base UI `render={<… />}` vs Radix `asChild`.
- `Select`: Base UI takes `items`; Radix uses `<SelectItem>` children.
- `ToggleGroup`: Base UI `multiple` boolean vs Radix `type="single" | "multiple"`.
The safest path is to **read the installed files and `c-*` examples** - they're already in your base, so reuse their wiring instead of guessing. When `get_component`'s inline `api` or an example shows the other base's shape, translate it to your base (or `validate_usage` to confirm). Defer the generic base/radix mechanics to the shadcn skill.
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# Craft: make ReUI UI exceptional, not generic
ReUI items ship senior-designer quality. Your adaptation has to hold that bar, so the result reads like a real product surface a team would keep - not a wireframe an AI generated. Use these alongside the reuse rules in [adapting.md](./adapting.md).
## Have a point of view
Pick an emotional register before you compose - calm, operational, premium, editorial, dense, energetic - and let layout, spacing, surface treatment, and icon behavior all reinforce it. One or two memorable decisions and restraint everywhere else beats ten generic ones. UI with no point of view reads as generated.
## Brutally clear hierarchy
One focal point per card or panel: the dominant metric or task first, its label second, supporting detail third. The first thing the eye lands on should be the right thing; secondary text must read as secondary. Borders, separators, and surfaces do real work to create 2-3 information bands - don't flatten everything to equal weight.
## Spacing rhythm and deliberate density
Gaps are a signal, not a default. Keep them intentional and consistent within a family (`gap-1`/`gap-2` for tight operational rows, larger gaps for section breaks), and smaller within a group than between groups. Match the surrounding ReUI density; don't pad an operational surface like a marketing page, and don't drift density mid-section. The composition should still feel authored in grayscale.
## Cover the real states (the usual miss)
A surface isn't done at the happy path. Compose, and wire:
- **Empty** - a purposeful empty state (short message + the primary action), never a blank panel.
- **Loading** - a **skeleton** that matches the real layout, not a centered spinner.
- **Error** - an inline, recoverable error with a retry, announced via `role="status"`/`aria-live`.
Derive these from an element the block already has (don't invent parallel markup), or `get_examples` for a state-specific example.
## Responsive by default
Mobile-first, not mobile-afterthought. In constrained rows/cards/sidebars, put `min-w-0` on the shrinking container and `truncate` long single-line labels; protect the primary label's width and let secondary content compress. Reflow layouts (multi-column -> single column) rather than just shrinking them. Desktop and mobile should both look designed.
## Motion, subtly
Motion should clarify, not decorate. Use ReUI Motion Icons on primary actions for a subtle hover cue; keep transitions short (~200-300ms) with calm easing; prefer a skeleton pulse over a spinner. No bouncing, no gratuitous entrance animations on every element.
## Real, activated content
Use believable, typed data (realistic labels, counts, timestamps, statuses that map to a real workflow) - never lorem or abstract filler. Every visible control does something: no decorative buttons, fake tabs, meaningless toggles, or stats with no job. It must still hold with long names, empty values, and crowded data.
## Avoid the AI tells
These instantly read as generated - don't ship them: equal-weight card walls, empty gradients, repetitive padding everywhere, generic enterprise copy, ornamental icons, and number tiles that don't earn their place.
## The bar
Before you finish, ask: **would a product team keep this instead of replacing it? Does it still feel strong after swapping in real content?** If not, reuse the shipped ReUI design harder - don't restyle it into something new - then run the [quality.md](./quality.md) gates.
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# Icons (ReUI delta over shadcn)
Follow the shadcn icon rules (use the project's configured `iconLibrary`, `data-icon` on icons inside `Button`, no sizing classes on icons inside components, pass icons as component objects not string keys). ReUI adds the following.
## Portable icons (library-agnostic)
ReUI components, examples, and blocks are authored to be icon-library-agnostic. When `iconLibrary` is set in `components.json`, the shadcn CLI installs each item's icons in **your** library automatically - you swap nothing. If an installed item's icons don't match your project (for example `iconLibrary` isn't set, so they came in from the item's demo library), change the **import source and component name** to your library, keeping the same icon-name semantics:
- `lucide` -> `lucide-react`
- `tabler` -> `@tabler/icons-react`
- `phosphor` -> `@phosphor-icons/react`
- `remix` -> `@remixicon/react`
- `hugeicons` -> `@hugeicons/react`
Don't assume `lucide-react`; read `iconLibrary` from `components.json`.
## Keep icons purposeful
Icons support the hierarchy, they don't replace it: keep them small, matched to the surrounding density, and decorative ones `aria-hidden="true"` (an icon-only control still needs an accessible label on the control). Don't add ornamental icons that do no job.
## Motion Icons (the `@reui/icons/...` set)
ReUI ships its own icon set in 4 styles (outline, solid, duotone, filled), each icon in two variants:
```bash
npx shadcn@latest add @reui/icons/default/<style>/<name> --yes # static
npx shadcn@latest add @reui/icons/animated/<style>/<name> --yes # hover-animated (motion/react)
```
Finding them via the MCP is free; installing requires an Ultimate license (`REUI_LICENSE_KEY`, see [cli.md](./cli.md)). Reach for a Motion Icon on a primary action when a subtle hover cue helps; keep motion restrained.
Finding icons:
- Several icons (the common case): **`search_icons(concepts[])`** - up to 24 concepts in one call, the best icons per concept with install commands. Pass `animated: true` to get only icons with a hover-animated Motion variant.
- One icon: `search` with `type: "icon"`.
- Icon results and `get_icon` carry `animated: true` and `installAnimated` when an animated variant exists - use those install strings, do not construct paths by hand.
- Every icon result carries a `previewUrl` (its live icon-category page) - **share it with the user** so they can SEE the icon before installing.
The `icon-stack` component composes multiple icons into a stacked display.
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# Quality gates (security, accessibility, scroll)
These are the **done gate**, not a nice-to-have: before you call any ReUI work finished, call the MCP `get_audit_checklist` tool and pass every item below (plus the craft bar in [craft.md](./craft.md)). Then typecheck and lint.
## Security
- Never `dangerouslySetInnerHTML`. Render data as text/components.
- External links (`target="_blank"`) must always pair `rel="noopener noreferrer"`.
- No real PII, secrets, or tokens in demo or committed code. Remote media only from sources the project already allows.
## Accessibility
- Implicit list/card items that navigate get real anchors with a standard hover affordance.
- Icon-only or numeric buttons need an `aria-label`; decorative icons get `aria-hidden`.
- Every non-submit button is `type="button"`.
- Keyboard + focus: everything interactive is reachable in a sensible Tab order with a visible focus ring; layers (dialogs/sheets/menus) trap focus and close on `Escape`. ReUI components ship standard keyboard behavior - read each component's inline `api` rather than re-implementing it.
- Announce async UI: loading and error messages use `role="status"` / `aria-live` so they're not silent to screen readers.
## Scroll mechanics
- Make scroll regions with a parent-owned height: a `min-h-0` + flex chain down to the scroll container. Never guess a `max-h`.
- The scroll container owns `overflow-auto`; ancestors stay `min-h-0` so the height resolves.
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# ReUI registry structure
ReUI is a shadcn-compatible registry with four entity types. **Examples and blocks are built FROM components** - reuse them, don't rebuild.
- **component** - one of the 17 ReUI building blocks with a real API (`data-grid`, `kanban`, `filters`, `date-selector`, `tree`, ...). Install directly (`@reui/data-grid`) or let it come in as a dependency of an example/block. Free. Read its API with `get_component(name)`.
- **example** - a free `c-*` single-pattern use-case of a component (`c-kanban-1`, `c-data-grid-3`). Install one and read it to copy real composition. Find a component's examples with `get_examples(name)`.
- **block** - a premium, full-page section that composes several components (`data-grid-2`, `pricing-page-1`). Pro or Ultimate license at install. Adapts to your active theme via semantic tokens.
- **icon** - Motion Icons in 4 styles (outline, solid, duotone, filled), static (`@reui/icons/default/<style>/<name>`) and hover-animated (`@reui/icons/animated/<style>/<name>`). Ultimate license at install. See [icons.md](./icons.md).
## The @reui registry
Install everything through the shadcn CLI: `npx shadcn@latest add @reui/<name> --yes`. The CLI reads the `@reui` registry from the project's `components.json`. Free items need only the plain string form:
```json
{ "registries": { "@reui": "https://reui.io/r/{style}/{name}.json" } }
```
Premium installs need the authenticated form + `REUI_LICENSE_KEY` in `.env.local` - see [cli.md](./cli.md). The MCP `get_project_context` tool returns the right config.
## Know your base: base or radix
ReUI ships every item in two builds - `base` (Base UI) and `radix` (Radix UI) - with mirrored names. The CLI installs the build matching your project automatically, but **you must write code against the right base's API**. Detect it from `components.json` -> `style`: the segment before the first `-` is the base (`base-nova` -> Base UI, `radix-nova` -> Radix UI). The installed files and `c-*` examples are already in your base - read them and adapt on that base. See [components.md](./components.md) for the API deltas.
**So the MCP's own `docsUrl` and `previewUrl` match your base**, send your `style` to the MCP: add `?style=<your components.json style>` to the ReUI MCP server URL (or set an `X-Reui-Style` header) in your MCP client config - set once, applies to every call. The MCP then resolves docs/preview links to YOUR library (`/docs/components/radix/...`, `/preview/radix/...` for a radix project) instead of the default base; `get_project_context` echoes back the style it currently sees so you can confirm it. Install commands are unaffected (the CLI already installs the right variant). If you notice the MCP returning `base` links for a `radix` project, tell the user to add `?style=` to the server URL.
Blocks adapt to your active theme through semantic tokens and CSS variables - change the theme and every block follows.
## Free vs premium
- **Free, no key:** the 17 components, all `c-*` examples, the ReUI MCP, and this skill.
- **Premium, license required at install:** blocks (Pro or Ultimate), Motion Icons and templates (Ultimate). Set `REUI_LICENSE_KEY` (see [cli.md](./cli.md)).
## Component API index
The canonical index of every component's API docs is **https://reui.io/llms.txt** (returned as `componentsApiUrl` in MCP results). Prefer the inline `api` from `get_component`; use the index/docs as the fallback.
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# Styling (ReUI delta over shadcn)
Follow the shadcn skill for the generic rules (semantic colors not raw values, `gap-*` not `space-y-*`, `size-*`, `cn()`, no manual `dark:` overrides, no overlay `z-index`). This file is only the ReUI-specific additions.
## ReUI extended semantic tokens
ReUI adds semantic tokens beyond shadcn's base set. Use these instead of raw colors for status and emphasis:
- `--success` / `--success-foreground`
- `--info` / `--info-foreground`
- `--warning` / `--warning-foreground`
- `--destructive-foreground` (paired with shadcn's `--destructive`)
- `--invert` / `--invert-foreground` (inverted surfaces)
Use them as Tailwind utilities (`bg-success text-success-foreground`, `text-warning`, ...). They are defined in the project's global CSS and registered with Tailwind (`@theme inline` on v4). If a token is missing in the project, add it to the global CSS file (never a new file) following the same `name` / `name-foreground` convention, exactly as the shadcn customization rules describe.
**Incorrect:** `<span className="text-green-600">Active</span>`
**Correct:** `<Badge variant="success">Active</Badge>` or `<span className="text-success">Active</span>`
## Blocks follow your theme
When you install a block it adapts to your active theme through the semantic tokens above and the project's CSS variables. Don't hardcode style-specific values into installed block code and don't fork it to "restyle" - change the theme via the CSS variables / a preset and every block follows. Want a different look? `search` for a block whose design already fits instead of re-skinning one.
## Density and typography rhythm
ReUI operational UI usually feels dense, not airy. Keep the gap between a title and its supporting description tight by default (`gap-0.5`, `space-y-1`, or `space-y-px`), and smaller than the gap between sections. Match the surrounding ReUI density when you add rows or fields; do not pad operational surfaces like a marketing page.
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# Workflow: find -> install -> read API -> adapt
The core ReUI loop. The MCP tells you what to install and gives you the API; the shadcn CLI installs it; you turn the installed files into correct, themed, data-wired code by **reuse**, not redesign.
## 1. Find (ReUI MCP `search` / `compose_page`)
**Full multi-section page ask?** Call `compose_page(intent, sections?)` FIRST, before searching block-by-block. It returns ordered sections, each with the best block for the intent (top pick + alternates); sections listed in `unavailableSections` have no real inventory - compose those from components, do not force a bad block.
For everything else, call `search` with the user's intent. Pass structured hints whenever you can infer them - you are an LLM, so do the parsing the server cannot:
- `type`: `"component"` (one of the 17 building blocks), `"example"` (a c-\* use-case), `"block"` (a full page/section), `"icon"`.
- `component`: the ReUI component the request implies (`"data-grid"`, `"kanban"`, ...).
- `category`, `features` (e.g. `["sortable","pagination"]`), `free`.
Example: "build a users management page with filters" -> `search({ query: "users management page with filters", type: "block", component: "data-grid", features: ["filters"] })`.
Each result has `install`, `previewUrl`, `docsUrl`, `componentsUsed`, `score`, `termCoverage`, and `whyMatch`. `score` is relative to the top hit (the top is ~100 by construction), not an absolute quality - compare results to each other, and show the user the top options if several score closely; do not silently guess. A low `termCoverage` means a weak match even with a high score - rephrase or widen.
**Always show the preview link.** Whenever you list or recommend items - from `search`, `search_icons`, `list_components`, `compose_page`, or a getter - include each item's `previewUrl` (a live preview page) so the user can SEE it before you install. Blocks and examples link to an individual live preview; icons and components to their live category/component page. This applies to every listing, not only a single pick.
## 2. Install (shadcn CLI)
Run the result's `install` command from the project root, non-interactively:
```bash
npx shadcn@latest add @reui/<name> --yes
```
The CLI reads `components.json`, installs the correct base+style variant, resolves `registryDependencies` (a block pulls in its components), installs npm deps, and rewrites aliases. Do not pass the base/style. See [cli.md](./cli.md).
## 3. Read the API (do not guess props)
Before writing code against any component an item uses:
1. The item's `componentDigests` already give a 1-line contract per component - often enough to wire it. For the full API, call **`get_component(names)`** with ALL of `componentsUsed` in ONE call (it accepts an array) and read each inline `api` - no web fetch. **Share the component's `docsUrl`** (its API documentation page) with the user whenever you work with that component's API, so they have the full reference; the `/llms.txt` index is a further fallback.
2. Call **`get_examples(name)`** for the free `c-*` examples of that component; install one and **read the added files** to copy the exact composition. This is the fastest correct path - the example shows real wiring you adapt, not invent.
3. About to write a prop you did not see in an `api` or installed file? Run **`validate_usage`** BEFORE writing the code - per-prop documented / notDocumented verdicts plus did-you-mean suggestions. notDocumented means read the API, not push on.
## 4. Adapt (reuse-first) - do not skip
Installing files is not the end, and redesigning them defeats the point. First note the project's **base** so you write the right API - read `components.json` -> `style` and take the segment before the first `-` (`base-nova` -> Base UI, `radix-nova` -> Radix UI), see [components.md](./components.md). After `add`:
1. **Read the added files**; keep the composition intact. For a block, verify the components are wired correctly (for `data-grid`: a `useReactTable` instance passed as `table`, `recordCount` set - see [components.md](./components.md)).
2. **Replace demo data with the user's real data** via typed structures (see [adapting.md](./adapting.md)).
3. **Fix icon imports** to the project's icon library (see [icons.md](./icons.md)).
4. **Align styling** to semantic tokens and the active theme - no raw colors (see [styling.md](./styling.md)).
5. **Validate before finalizing**: if your adaptation introduced components or props you did not read in an `api` or example, run `validate_usage` on them.
6. **Hit the craft bar** - clear hierarchy, deliberate density, the empty / loading / error states, subtle motion, and mobile-first responsiveness (see [craft.md](./craft.md)). Generic-looking output means you under-reused the design, not that it needs restyling.
7. **Pass the quality gates** (security, a11y, scroll) - call the MCP `get_audit_checklist` tool and clear every item (see [quality.md](./quality.md)).
8. **Typecheck / lint**.
## If no single block fits
Compose from components (`compose_page` tells you which sections have no block inventory via `unavailableSections`). `search` the components you need, read each `get_component` API, install a worked `get_examples` example for each, and assemble by adapting those examples. A block in the same category is a useful reference - install it and read its files to see how ReUI composes those components, then adapt.
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# ReUI MCP: full reference
The ReUI MCP (`https://mcp.reui.io`, Streamable HTTP) is free to use but needs a ReUI account: on first use the agent signs in with ReUI (a free account is created if the user has none), so every request is tied to an account. Free covers components and examples; a Pro or Ultimate license unlocks premium blocks and Motion Icons and removes the daily request limit. It does **discovery + guidance** (search, inline APIs, page planning, validation) and never serves source; the shadcn CLI does **installation**, and the license key lives there (the `@reui` entry in `components.json`, backed by `.env.local`). Goal: from the user's intent to correct, themed, data-wired ReUI code in the **fewest tokens and calls**, with **no guessing**.
## Golden path (token-optimal - follow this order)
Most tasks need 2-4 MCP calls and ZERO web fetches:
1. **`search(query, ...hints)`** -> pick the top 1-3 results. Each result already carries `install`, `previewUrl`, `docsUrl`, `componentsUsed`, `score`, `whyMatch`. The payload is complete - do not call another tool just to "confirm" a result.
2. **`get_component([...componentsUsed])`** in ONE batched call (one name or an array of up to 20) -> read each inline `api`. This **replaces** fetching docs pages. Often skippable: search responses carry `componentDigests`, a compact API contract per referenced component.
3. **`get_examples(component)`** -> install ONE returned `c-*` example, read the added files, copy the composition.
4. **`get_install_command(item)`** only to validate a name you are unsure of (results already include `install`). Run the install with the shadcn CLI (`--yes`).
5. **`get_audit_checklist()`** before declaring done.
If you already know the exact item name, skip `search`. Everything else is situational.
## The 5 task-specific tools (when to reach for each)
- **`compose_page`** - BEFORE building any full page (dashboard, settings, billing, landing). Pass the intent (and optionally the sections you want); it returns ordered sections, each with the best premium block for the intent (top pick + alternates). Sections with no real inventory are listed honestly in `unavailableSections` - compose those from components instead of forcing a bad block.
- **`search_icons`** - whenever you need icons, especially several. Batch up to 24 concepts in one call; each concept returns its best icons with install commands. Pass `animated: true` to get only icons that have a hover-animated Motion variant.
- **`validate_usage`** - BEFORE writing code with component names or props you have not read in an inline `api` or an installed example. It checks planned names + props against the indexed API docs and registry item names; returns did-you-mean suggestions and per-prop documented / notDocumented verdicts. Deterministic, no inference - a notDocumented prop means stop and read the API, not push on.
- **`whats_new`** - when your registry knowledge might be stale (a name 404s, the user mentions an item you don't know). Returns items added/removed per build, newest first.
- **`report_issue`** - when an installed item is actually broken (bad source, wrong dependency, broken preview). Goes straight to the ReUI team; rate-limited 5/hour. Not for usage questions.
## All 19 tools
`search`, `get_block`, `get_example`, `get_icon`, `list_block_groups`, `list_block_categories`, `list_example_categories`, `list_icon_categories`, `list_components`, `get_component`, `get_examples`, `search_icons`, `compose_page`, `validate_usage`, `whats_new`, `report_issue`, `get_install_command`, `get_project_context`, `get_audit_checklist`. The MCP serves the full parameter schemas; do not guess parameters beyond them.
## Token + speed rules
- **Batch `get_component`** - ONE call with the whole `componentsUsed` array, never N calls. Skip it entirely when `componentDigests` already answers the question.
- **Read source by installing** - the MCP serves no source. To read or analyze an item's real code, install it with the shadcn CLI and open the local files. Learn an API from the inline `api` / `componentDigests`, never by reading raw source.
- **Infer `search` hints yourself** (`type`, `component`, `category`, `features`, `free`) - hints shrink the result set and the tokens. Keep `limit` low; one right result beats ten.
- Run independent calls (and the shadcn install) concurrently in one turn - serial tool calls are the main source of slowness.
- Don't repeat a search for the same intent; don't call `list_*` to "see everything" - `search` is the entry point, `list_*` is only for browsing a taxonomy the user explicitly wants to explore.
- Prefer `get_component`'s inline `api` over `docsUrl` / `/llms.txt`. Fetch a web page only as a last resort.
## Result shapes (so you don't re-fetch)
- `score` is 0-100 RELATIVE to the top hit (the top is ~100 by construction), not absolute - compare results to each other.
- `termCoverage` (0-1) is the share of the query the item matched - low means a weak match even if the score looks high; rephrase or widen the search.
- Each result carries `whyMatch`, `install`, docs/preview URLs, and a `free` flag; premium items carry `requiredPlan` (`"pro"` for blocks, `"ultimate"` for icons).
- `componentDigests` is a top-level map: a compact API contract per referenced component - often enough to wire an item without a `get_component` call.
- Icon results and `get_icon` include `animated: true` and `installAnimated` when a hover-animated Motion variant exists (animated: `@reui/icons/animated/<style>/<name>`; static: `@reui/icons/default/<style>/<name>`).
## Error playbook
- **401** - the MCP requires a signed-in ReUI account. The client prompts "Sign in with ReUI" (OAuth) on first use; a free account is created if needed. For headless/CI, pass a personal token (`reui_pat_...`, created at https://reui.io/account/mcp) as `Authorization: Bearer`.
- **403 / locked result** - a valid account but the plan does not cover the item: premium blocks need Pro, Motion Icons need Ultimate. Point to https://reui.io/pricing (upgrade). Free accounts still get all components + examples.
- **429** - rate limited (120 requests/min per IP); back off, honor `Retry-After`.
- **not found** (`found: false`) - use the returned `suggestions`, or `search`; check `whats_new` if you suspect a stale name. Never run a fabricated install command.
## Fallbacks
- No ReUI MCP: `npx shadcn@latest search @reui -q "..."` then `add` (generic, no scoring / inline API).
- The shadcn project's own MCP also works over the `@reui` registry: https://ui.shadcn.com/docs/mcp.
Per-agent MCP setup: https://reui.io/docs/mcp
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{
"mcpServers": {
"reui": {
"url": "https://mcp.reui.io/api/mcp"
}
}
}
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---
description: Frontend monorepo — apps/web + packages/ui (@evofw/ui), shadcn CLI
globs:
- apps/web/**
- packages/ui/**
alwaysApply: false
---
# Frontend Monorepo (shadcn/ui + ReUI)
**Стандарт:** [Monorepo docs](https://ui.shadcn.com/docs/monorepo), ReUI — [Get Started](https://reui.io/docs/get-started).
## Layout
```
apps/web/ # Vite SPA (routes, queries, domain, reui, reui-kit)
apps/api/ # Fastify API
packages/ui/ # @evofw/ui — shadcn primitives
packages/shared/ # @evofw/shared — Zod
packages/db/ # @evofw/db — Drizzle
```
## Два components.json
| Файл | Назначение |
|------|------------|
| [`apps/web/components.json`](../../apps/web/components.json) | App aliases; `ui` → `@evofw/ui/components`; registry `@reui` + license |
| [`packages/ui/components.json`](../../packages/ui/components.json) | UI package aliases |
Синхронизировать: `style`, `iconLibrary`, `baseColor`.
## CLI — только из apps/web
```bash
cd apps/web
pnpm dlx shadcn@latest add button
pnpm dlx shadcn@latest add @reui/frame @reui/data-grid @reui/filters
pnpm dlx shadcn@latest apply b2fA --only theme -y
```
Нужен `REUI_LICENSE_KEY` в `apps/web/.env.local`.
## Куда CLI кладёт файлы
| Команда | Куда |
|---------|------|
| `add button` | `packages/ui/src/components/button.tsx` |
| `add @reui/data-grid` | `apps/web/src/components/reui/data-grid/` |
## Импорты
```tsx
import { Button } from '@evofw/ui/components/button'
import { cn } from '@evofw/ui/lib/utils'
import '@evofw/ui/globals.css'
```
| Запрещено | Разрешено |
|-----------|-----------|
| `@/components/ui/*` | `@evofw/ui/components/*` |
| ReUI в `packages/ui` | `@/components/reui/*` |
| Ручной `globals.css` | CLI `apply --only theme` |
## Стили (Tailwind v4)
`packages/ui/src/styles/globals.css` — единственный CSS. Обязательно `@source` для `packages/ui` и `apps/web`.
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---
description: Frontend — shadcn/ui + ReUI PRO workflow для EvoFirewall
globs:
- apps/web/**
- packages/ui/**
alwaysApply: false
---
# Frontend — shadcn/ui + ReUI PRO
**Источники:** MCP **`user-reui`** + **`plugin-shadcn-shadcn`** + docs. Не выдумывать UI.
| Документ | URL |
|----------|-----|
| shadcn Components | https://ui.shadcn.com/docs/components |
| ReUI Blocks | https://reui.io/blocks |
| ReUI llms.txt | https://reui.io/llms.txt |
| License | https://reui.io/docs/license-setup |
| Design contract | [`docs/ui-design-contract.md`](../../docs/ui-design-contract.md) |
## Шаг 0
0. Поиск `reui-kit/*` / shared
1. Pages / KPI / settings / enterprise → `user-reui` (`search` → `get_block` / `compose_page`) + cite `previewUrl`
2. Primitives → `plugin-shadcn-shadcn` + `pnpm dlx shadcn@latest docs <component>`
3. CLI add из `apps/web` → adapt
## Shared / kit (цель)
| Component | Путь |
|-----------|------|
| `ResourcePage` | `reui-kit/resource-page.tsx` |
| `KpiStatGrid` | `reui-kit/kpi-stat-grid.tsx` |
| `OpsDashboard` | `reui-kit/ops-dashboard.tsx` |
| `SettingsShell` | `reui-kit/settings-shell.tsx` |
| `DetailPanel` | `reui-kit/detail-panel.tsx` |
## Приоритет композиции
1. `@evofw/ui/components/*`
2. ReUI PRO block → adapt
3. `reui-kit/*` + shared
4. Domain-обёртка
## Запрещено
| ❌ | ✅ |
|----|-----|
| raw `<table>` | DataGrid / `ResourcePage` |
| `bg-emerald-*` | semantic / ReUI `variant` |
| Card как ops-shell | ReUI `Frame` |
| Hand-roll KPI | `KpiStatGrid` / [stats-12](https://reui.io/preview/base/stats-12) |
| `space-y-*` | `flex` + `gap-*` |
| `@/components/ui/*` | `@evofw/ui/components/*` |
## Эталоны
| Зона | Preview |
|------|---------|
| Shell | https://reui.io/preview/base/app-shell-12 |
| Login | https://reui.io/preview/base/auth-13 |
| Dashboard / KPI | https://reui.io/preview/base/stats-12 |
| Lists | https://reui.io/preview/base/data-grid-filtering-2 |
| Settings | https://reui.io/preview/base/settings-16 |
| Empty | https://reui.io/preview/base/empty-state-12 |
См. [`reui-mcp.mdc`](reui-mcp.mdc), [`frontend-ui-patterns.mdc`](frontend-ui-patterns.mdc).
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---
description: Frontend UI patterns — Frame surface, kit, spacing, states
globs:
- apps/web/**
- packages/ui/**
alwaysApply: false
---
# Frontend UI Patterns
См. [`frontend-shadcn.mdc`](frontend-shadcn.mdc), [`reui-mcp.mdc`](reui-mcp.mdc), [`docs/ui-design-contract.md`](../../docs/ui-design-contract.md), [llms.txt](https://reui.io/llms.txt).
## Surface
**`surface: frame`**. Ops / list / dashboard / detail / settings — ReUI Frame, не Card shell.
## Docs workflow
0. Поиск `reui-kit/*`
1. MCP **`user-reui`** — search → `get_block` / `compose_page` (`surface: "frame"`) — cite `previewUrl` + `docsUrl`
2. Primitives: `plugin-shadcn-shadcn` + CLI docs
3. CLI: `cd apps/web && pnpm dlx shadcn@latest add @reui/...`
4. Adapt в kit — не hand-roll
5. Context7 — только TanStack / Recharts
6. `validate_usage` / `get_audit_checklist`
## Матрица
| Элемент | Shared | Preview |
|---------|--------|---------|
| Page wrapper | `PageShell` | — |
| KPI | `reui-kit/KpiStatGrid` | [stats-12](https://reui.io/preview/base/stats-12) |
| Data list | `reui-kit/ResourcePage` | [data-grid-filtering-2](https://reui.io/preview/base/data-grid-filtering-2) |
| Dashboard | `reui-kit/OpsDashboard` | [dashboard-1](https://reui.io/preview/base/dashboard-1) |
| Settings | `reui-kit/SettingsShell` | [settings-16](https://reui.io/preview/base/settings-16) |
| Empty | `EmptyState` | [empty-state-12](https://reui.io/preview/base/empty-state-12) |
| Status | `StatusBadge` | `@reui/badge` |
| Nav | `AppShell` | [app-shell-12](https://reui.io/preview/base/app-shell-12) |
## Spacing
```
AppShell main: gap-4 md:gap-6, px-4 md:px-6, py-4 md:py-5
PageShell: gap-4 md:gap-6
Toolbar: gap-2
```
**Запрещено:** `space-y-*`, raw colors, Card как ops-shell, page-level Spinner без Skeleton.
## Button hierarchy
Max 1 primary (`default`) на экран; остальные `outline` / `ghost`.
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---
description: ReUI PRO (@reui) — MCP user-reui, Frame surface, kit, license, матрица выбора
alwaysApply: true
---
# ReUI MCP — обязательно (PRO + free)
Проект: **Base UI** (`style: base-nova`), surface lock **`frame`**.
Связанные: [`shadcn-mcp.mdc`](shadcn-mcp.mdc), [`frontend-monorepo.mdc`](frontend-monorepo.mdc), [`frontend-shadcn.mdc`](frontend-shadcn.mdc), [`frontend-ui-patterns.mdc`](frontend-ui-patterns.mdc), [`docs/ui-design-contract.md`](../../docs/ui-design-contract.md).
Skill: [`.agents/skills/reui/SKILL.md`](../../.agents/skills/reui/SKILL.md) (версия из `get_agent_skill`; обновление: `curl -fsSL https://mcp.reui.io/install | node -`).
| Документ | URL |
|----------|-----|
| **llms.txt** | https://reui.io/llms.txt |
| **Get Started** | https://reui.io/docs/get-started |
| **Styling** | https://reui.io/docs/styling |
| **MCP** | https://reui.io/docs/mcp |
| **Blocks** | https://reui.io/blocks |
| **Settings blocks** | https://reui.io/blocks/application/settings |
| **License** | https://reui.io/docs/license-setup |
| **Agent skills** | https://reui.io/docs/agent-skills |
| **Base UI components** | https://reui.io/docs/components/base/<name> |
## Primary MCP
1. **`user-reui`** — `search` / `compose_page` / `get_block` / `get_component` / `get_install_command` / `validate_usage` / `get_audit_checklist`
2. **`plugin-shadcn-shadcn`** — primitives `@shadcn`; для `@reui` — вторично
**Обязательно** цитировать `previewUrl` + `docsUrl` для каждой UI-зоны.
## Когда ReUI vs shadcn
| Задача | Registry | Импорт |
|--------|----------|--------|
| Button, Sheet, Field, Sidebar, Tabs | `@shadcn` | `@evofw/ui/components/*` |
| PRO pages/sections (settings, stats, auth, dashboard) | `@reui` blocks | adapt → `apps/web/src/components/` / `reui-kit/` |
| Data Grid | `@reui` | `@/components/reui/data-grid/*` → `ResourcePage` |
| Filters | `@reui` | `@/components/reui/filters` |
| Frame surface | `@reui` | `@/components/reui/frame` |
| KPI | block [stats-12](https://reui.io/preview/base/stats-12) | `reui-kit/KpiStatGrid` |
| Semantic badge / alert | `@reui` | `@/components/reui/badge`, `@/components/reui/alert` |
| Number / date / autocomplete / color / kanban | `@reui` | `@/components/reui/*` |
**Сложные списки** — `ResourcePage` (Frame + data-grid + filters), не raw `<table>`.
## MCP workflow
0. Поиск существующих `reui-kit/*`, `@/components/reui/*`
1. `user-reui` `search` (`surface: "frame"`, `category` при известном)
2. Страница целиком → `compose_page`; секция → `get_block`
3. `get_component` для API primitives из `componentsUsed`
4. CLI из `apps/web`: `pnpm dlx shadcn@latest add @reui/<name> --yes`
5. Post-add: shadcn imports → `@evofw/ui/components/*`
6. Adapt by reuse → kit / route
7. `validate_usage` + `get_audit_checklist`
## Размещение
| Слой | Путь | Импорт |
|------|------|--------|
| shadcn | `packages/ui/src/components/` | `@evofw/ui/components/*` |
| ReUI CLI | `apps/web/src/components/reui/` | `@/components/reui/*` |
| PRO blocks (reference) | `apps/web/src/components/blocks/` | adapt into kit, не копипаст в routes |
| Kit | `apps/web/src/components/reui-kit/` | `@/components/reui-kit/*` |
## License
```env
# apps/web/.env.local (gitignored)
REUI_LICENSE_KEY=
```
`apps/web/components.json` → `@reui` с `Authorization: Bearer ${REUI_LICENSE_KEY}`.
## Эталоны preview
| Зона | Preview |
|------|---------|
| KPI | https://reui.io/preview/base/stats-12 |
| List | https://reui.io/preview/base/data-grid-filtering-2 |
| Settings | https://reui.io/preview/base/settings-16 |
| Auth | https://reui.io/preview/base/auth-13 |
| Shell | https://reui.io/preview/base/app-shell-12 |
| Empty | https://reui.io/preview/base/empty-state-12 |
## Запрещено
- Копипаст с reui.io без CLI
- ReUI в `packages/ui` / импорт как `@evofw/ui`
- Radix-варианты docs — только Base UI
- Raw `bg-emerald-*` вместо ReUI `variant`
- Hand-roll data-grid/filters/KPI/settings rows при наличии `@reui` / kit
- Смешивать Card и Frame на ops-экране
## Чеклист
- [ ] `user-reui` search/get_block + previewUrl
- [ ] `surface: frame`
- [ ] CLI add из `apps/web` при новом item
- [ ] Kit / `@/components/reui` / `@evofw/ui` — правильный слой
- [ ] `pnpm --filter web build` (после init Vite)
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---
description: Use the ReUI registry (blocks, primitives, icons) correctly
globs: ["**/*.tsx","**/*.ts"]
alwaysApply: false
---
---
name: reui
description: Use the ReUI registry from your AI agent - find, install, and correctly use ReUI components (the 17 free building blocks like data-grid, kanban, filters), their free examples, premium blocks, and Motion Icons. Applies in any project using ReUI, the @reui registry, REUI_LICENSE_KEY, or any shadcn project where the user asks for premium blocks, data grids, kanban boards, dashboards, or full pages. Pairs with the free ReUI MCP server for live, scored registry search and inline component APIs.
user-invocable: false
allowed-tools: Bash(npx shadcn@latest *), Bash(pnpm dlx shadcn@latest *), Bash(bunx --bun shadcn@latest *)
---
> **ReUI skill version `42d70dcc3d`.** If the ReUI MCP's `get_agent_skill` reports a newer `version`, re-run the ReUI installer (see `get_agent_skill` -> `install.recommended`) to update this skill. Cloud/tools-only agents have no local file and always read the latest - they can ignore this.
# ReUI for Agents
ReUI is a shadcn-compatible registry. It ships four things you **reuse** - never redesign:
- **components** - the 17 ReUI building blocks with real APIs: `data-grid`, `kanban`, `filters`, `date-selector`, `tree`, `stepper`, ... (free)
- **examples** - free `c-*` single-pattern use-cases of a component (`c-kanban-1`); install one and read it to see exact composition
- **blocks** - premium full-page sections that compose components (`data-grid-2`, `pricing-page-1`); Pro or Ultimate license at install
- **icons** - Motion Icons in 4 styles, static + hover-animated variants; Ultimate license at install
The skill is free and this MCP is free to use; it just needs a ReUI account. On first use your agent opens a browser "Sign in with ReUI" prompt (a free account is created if you don't have one). Free covers components and examples with a daily request allowance; a Pro or Ultimate license unlocks premium blocks and Motion Icons and removes the limit (see [rules/registry.md](./rules/registry.md)). The same account and skill work in every agent and service the MCP connects to - this skill is agent-agnostic.
Skill + MCP are a team: this skill is the workflow (how to find, install, read the API, and adapt by reuse); the MCP is the live data and the hands (search, get_component, install commands). Your job: find the right item, install it with the shadcn CLI, read its real API, and **adapt by reuse** - wire real data and theme it; do not hand-roll or restyle what ReUI already provides. This skill **layers on the shadcn skill**: follow that for generic rules (spacing, `cn()`, semantic colors, forms); follow this for everything ReUI-specific.
## The core loop (MCP-native)
1. **Find** - call the ReUI MCP `search` tool with the user's intent. It returns a ranked, scored list across components/examples/blocks/icons, each with an `install` command, `previewUrl`, `docsUrl`, and `componentsUsed`. Pass hints (`type`, `component`, `category`, `features`, `free`) when you can infer them.
2. **Install** - run the returned command non-interactively (`npx shadcn@latest add @reui/<name> --yes`). The CLI resolves deps, aliases, and the base/style from `components.json`. See [cli.md](./rules/cli.md).
3. **Read the API (on your base)** - first note your base from `components.json` -> `style` (`base-nova` -> Base UI, `radix-nova` -> Radix UI). For each component an item uses, call `get_component(name)` and read its **inline `api`** (no web fetch); then `get_examples(name)` to install a worked example and copy its composition - the installed files are already in your base. Whenever you work with a component's API, also **share its `docsUrl`** (the primitive's API documentation page) with the user so they have the full reference. See [components.md](./rules/components.md).
4. **Adapt (reuse-first)** - swap demo data for real data, fix icon imports, align tokens. Do not redesign. See [adapting.md](./rules/adapting.md).
**Always show the preview.** Every item a tool returns carries a `previewUrl` (a live preview page). Whenever you list, recommend, or present ReUI items to the user - blocks, components, examples, or icons, whether from `search`, `search_icons`, `list_components`, `compose_page`, or any getter - include each item's `previewUrl` so they can SEE it before installing. Blocks and examples open an individual live preview; icons and components link to their live category/component page. Never present an item without its preview link.
If the ReUI MCP is not configured, fall back to `npx shadcn@latest search @reui -q "..."` then `add` - but the MCP gives scored matches + inline APIs; prefer it.
## Commands
Run ReUI as explicit slash commands (via the ReUI MCP) **or** just ask in plain language - both run the same workflow.
| Command | Invoke | Does |
| ----------- | ------------------------------ | ------------------------------------------------------------------------------------------------------------------ |
| **build** | `/mcp__reui__build <what>` | Compose a page/section/feature from ReUI: plan в†’ install в†’ read API в†’ adapt в†’ craft в†’ audit. |
| **add** | `/mcp__reui__add <item>` | Find & install one component/example/block/icon and wire it in. |
| **fix** | `/mcp__reui__fix [target]` | Diagnose & fix ReUI usage: wrong/undocumented props, base/radix mismatch, missing states, a11y/scroll. |
| **improve** | `/mcp__reui__improve [target]` | Refine + extend existing ReUI UI to a production-exceptional bar (hierarchy, density, states, responsive, motion). |
Invocation differs slightly per agent (`/mcp__reui__build` in Claude Code/Cursor/Windsurf, `/mcp.reui.build` in VS Code). No command surface? Just describe what you want - this skill drives the identical loop.
## When to reach for ReUI vs plain shadcn
| Need | Reach for |
| -------------------------------------------------------------------- | ------------------------------------------------------------------------- |
| A full page or section (dashboard, billing, auth, pricing, settings) | `compose_page` first (plans sections + best blocks), then ReUI **blocks** |
| A data table with sorting/filtering/pagination/virtualization | the **data-grid** component (never hand-roll a `<table>`) |
| A drag-and-drop board | the **kanban** component |
| Advanced column filtering, date range, tree, stepper, ... | the matching ReUI **component** |
| A single generic control already in shadcn (Button, Dialog, Select) | plain **shadcn** |
## Detailed references
- [rules/registry.md](./rules/registry.md) - the four types, the @reui registry, base/radix, free vs premium + license
- [rules/workflow.md](./rules/workflow.md) - the find -> install -> read-API -> adapt loop (most important)
- [rules/components.md](./rules/components.md) - the 17 components, the data-grid contract, base vs radix
- [rules/adapting.md](./rules/adapting.md) - reuse-first: preserve the design (no over-customizing), reuse examples + a block's own elements, real data, don't invent APIs
- [rules/craft.md](./rules/craft.md) - make it exceptional: point of view, hierarchy, density, states, responsive, motion, the bar
- [rules/quality.md](./rules/quality.md) - security, accessibility, and scroll gates (the done gate)
- [rules/styling.md](./rules/styling.md) - ReUI extended tokens, theme adaptation, density
- [rules/icons.md](./rules/icons.md) - portable icons, swapping imports, Motion Icons (static + animated)
- [tools.md](./tools.md) - the ReUI MCP: golden path, the 19 tools, token rules, result shapes, errors
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---
description: ВСЕГДА использовать MCP-плагин shadcn UI перед любым UI-кодом
alwaysApply: true
---
# shadcn MCP — обязательно
Перед **любой** задачей с UI (новый экран, компонент, стили, рефакторинг внешнего вида) — **сначала MCP** `plugin-shadcn-shadcn`, не память и не веб-поиск.
CLI и docs — **после** MCP, по команде из `get_add_command_for_items`.
Enterprise / PRO (Data Grid, Filters, Frame, blocks) — дополнительно [`reui-mcp.mdc`](reui-mcp.mdc) и MCP **`user-reui`**.
## Порядок (строго)
0. Поиск существующих shared / `reui-kit`
1. **`get_project_registries`** — какие registry доступны (`@shadcn`, `@reui`)
2. **`search_items_in_registries`** — компонент, block, example
3. **`get_item_examples_from_registries`** — полный код примера перед написанием JSX
4. **`get_add_command_for_items`** — точная CLI-команда `pnpm dlx shadcn@latest add ...`
5. Выполнить add из `apps/web` (см. [`frontend-monorepo.mdc`](frontend-monorepo.mdc))
6. **CLI docs:** `cd apps/web && pnpm dlx shadcn@latest docs <component>` — сверить API с [ui.shadcn.com/docs/components](https://ui.shadcn.com/docs/components)
7. Сверить examples из MCP с API из docs CLI — реализовать только после совпадения
8. Адаптировать пример под TanStack Router / Query → `apps/web/src/`
9. **Context7** — только TanStack / Recharts / не-shadcn
10. **`get_audit_checklist`** — перед merge PR
## Когда вызывать MCP
| Задача | MCP |
|--------|-----|
| Новая страница / layout | `user-reui` compose/block **или** shadcn `search` → block |
| Нет примитива в `@evofw/ui` | `plugin-shadcn-shadcn` → add |
| Data Grid, Filters, Frame, KPI | `user-reui` ([`reui-mcp.mdc`](reui-mcp.mdc)) |
| Сомнение в API/props | examples + `get_component` |
| Ревью UI перед сдачей | `get_audit_checklist` / ReUI `validate_usage` |
## Запрещено
- Писать UI по памяти, не проверив MCP
- Копипаст с ui.shadcn.com / reui.io без CLI
- Самописные примитивы, если есть item в registry
- Пропускать MCP «потому что компонент простой»
## Сервер и инструменты
- **MCP:** `plugin-shadcn-shadcn` + `user-reui`
- Перед вызовом — schema инструмента
Связанные: [`shadcn-ui-production.mdc`](shadcn-ui-production.mdc), [`reui-mcp.mdc`](reui-mcp.mdc), skill `.agents/skills/shadcn`.
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---
description: shadcn/ui + ReUI PRO — глобальные UI-принципы EvoFirewall
alwaysApply: true
---
# shadcn/ui — правила проекта
UI строится по [shadcn/ui](https://ui.shadcn.com/docs/installation) + **ReUI** (`@reui`): [Components](https://ui.shadcn.com/docs/components), [Blocks](https://ui.shadcn.com/blocks), [ReUI Get Started](https://reui.io/docs/get-started), [llms.txt](https://reui.io/llms.txt).
**Первый шаг UI-задачи:**
1. MCP **`user-reui`** для pages / KPI / data-grid / settings / Frame (`surface: frame`)
2. MCP **`plugin-shadcn-shadcn`** для primitives `@shadcn`
См. [`shadcn-mcp.mdc`](shadcn-mcp.mdc), [`reui-mcp.mdc`](reui-mcp.mdc).
## Frontend
Детали: [`frontend-shadcn.mdc`](frontend-shadcn.mdc), [`frontend-ui-patterns.mdc`](frontend-ui-patterns.mdc), [`frontend-monorepo.mdc`](frontend-monorepo.mdc), [`docs/ui-design-contract.md`](../../docs/ui-design-contract.md).
Кратко: MCP → CLI из `apps/web` → Block → kit → `pnpm --filter @evofw/web build`. Кастомный CSS и самописные примитивы **запрещены**.
## Стек
- Monorepo: `apps/web` + `packages/ui` (`@evofw/ui`), pnpm workspaces
- Vite + TanStack Router/Query + shadcn **base-nova** + ReUI **@reui**
- Конфиг: [`apps/web/components.json`](../../apps/web/components.json), [`packages/ui/components.json`](../../packages/ui/components.json)
- Тема: `pnpm dlx shadcn@latest apply b2fA --only theme -y`; ReUI tokens — [Styling](https://reui.io/docs/styling)
- License: `REUI_LICENSE_KEY` в `apps/web/.env.local`
## Язык
Русский.
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{
"plugins": {
"shadcn": {
"enabled": true
}
}
}
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---
name: reui
description: Use the ReUI registry from your AI agent - find, install, and correctly use ReUI components (the 17 free building blocks like data-grid, kanban, filters), their free examples, premium blocks, and Motion Icons. Applies in any project using ReUI, the @reui registry, REUI_LICENSE_KEY, or any shadcn project where the user asks for premium blocks, data grids, kanban boards, dashboards, or full pages. Pairs with the free ReUI MCP server for live, scored registry search and inline component APIs.
user-invocable: false
allowed-tools: Bash(npx shadcn@latest *), Bash(pnpm dlx shadcn@latest *), Bash(bunx --bun shadcn@latest *)
---
> **ReUI skill version `42d70dcc3d`.** If the ReUI MCP's `get_agent_skill` reports a newer `version`, re-run the ReUI installer (see `get_agent_skill` -> `install.recommended`) to update this skill. Cloud/tools-only agents have no local file and always read the latest - they can ignore this.
# ReUI for Agents
ReUI is a shadcn-compatible registry. It ships four things you **reuse** - never redesign:
- **components** - the 17 ReUI building blocks with real APIs: `data-grid`, `kanban`, `filters`, `date-selector`, `tree`, `stepper`, ... (free)
- **examples** - free `c-*` single-pattern use-cases of a component (`c-kanban-1`); install one and read it to see exact composition
- **blocks** - premium full-page sections that compose components (`data-grid-2`, `pricing-page-1`); Pro or Ultimate license at install
- **icons** - Motion Icons in 4 styles, static + hover-animated variants; Ultimate license at install
The skill is free and this MCP is free to use; it just needs a ReUI account. On first use your agent opens a browser "Sign in with ReUI" prompt (a free account is created if you don't have one). Free covers components and examples with a daily request allowance; a Pro or Ultimate license unlocks premium blocks and Motion Icons and removes the limit (see [rules/registry.md](./rules/registry.md)). The same account and skill work in every agent and service the MCP connects to - this skill is agent-agnostic.
Skill + MCP are a team: this skill is the workflow (how to find, install, read the API, and adapt by reuse); the MCP is the live data and the hands (search, get_component, install commands). Your job: find the right item, install it with the shadcn CLI, read its real API, and **adapt by reuse** - wire real data and theme it; do not hand-roll or restyle what ReUI already provides. This skill **layers on the shadcn skill**: follow that for generic rules (spacing, `cn()`, semantic colors, forms); follow this for everything ReUI-specific.
## The core loop (MCP-native)
1. **Find** - call the ReUI MCP `search` tool with the user's intent. It returns a ranked, scored list across components/examples/blocks/icons, each with an `install` command, `previewUrl`, `docsUrl`, and `componentsUsed`. Pass hints (`type`, `component`, `category`, `features`, `free`) when you can infer them.
2. **Install** - run the returned command non-interactively (`npx shadcn@latest add @reui/<name> --yes`). The CLI resolves deps, aliases, and the base/style from `components.json`. See [cli.md](./rules/cli.md).
3. **Read the API (on your base)** - first note your base from `components.json` -> `style` (`base-nova` -> Base UI, `radix-nova` -> Radix UI). For each component an item uses, call `get_component(name)` and read its **inline `api`** (no web fetch); then `get_examples(name)` to install a worked example and copy its composition - the installed files are already in your base. Whenever you work with a component's API, also **share its `docsUrl`** (the primitive's API documentation page) with the user so they have the full reference. See [components.md](./rules/components.md).
4. **Adapt (reuse-first)** - swap demo data for real data, fix icon imports, align tokens. Do not redesign. See [adapting.md](./rules/adapting.md).
**Always show the preview.** Every item a tool returns carries a `previewUrl` (a live preview page). Whenever you list, recommend, or present ReUI items to the user - blocks, components, examples, or icons, whether from `search`, `search_icons`, `list_components`, `compose_page`, or any getter - include each item's `previewUrl` so they can SEE it before installing. Blocks and examples open an individual live preview; icons and components link to their live category/component page. Never present an item without its preview link.
If the ReUI MCP is not configured, fall back to `npx shadcn@latest search @reui -q "..."` then `add` - but the MCP gives scored matches + inline APIs; prefer it.
## Commands
Run ReUI as explicit slash commands (via the ReUI MCP) **or** just ask in plain language - both run the same workflow.
| Command | Invoke | Does |
| ----------- | ------------------------------ | ------------------------------------------------------------------------------------------------------------------ |
| **build** | `/mcp__reui__build <what>` | Compose a page/section/feature from ReUI: plan → install → read API → adapt → craft → audit. |
| **add** | `/mcp__reui__add <item>` | Find & install one component/example/block/icon and wire it in. |
| **fix** | `/mcp__reui__fix [target]` | Diagnose & fix ReUI usage: wrong/undocumented props, base/radix mismatch, missing states, a11y/scroll. |
| **improve** | `/mcp__reui__improve [target]` | Refine + extend existing ReUI UI to a production-exceptional bar (hierarchy, density, states, responsive, motion). |
Invocation differs slightly per agent (`/mcp__reui__build` in Claude Code/Cursor/Windsurf, `/mcp.reui.build` in VS Code). No command surface? Just describe what you want - this skill drives the identical loop.
## When to reach for ReUI vs plain shadcn
| Need | Reach for |
| -------------------------------------------------------------------- | ------------------------------------------------------------------------- |
| A full page or section (dashboard, billing, auth, pricing, settings) | `compose_page` first (plans sections + best blocks), then ReUI **blocks** |
| A data table with sorting/filtering/pagination/virtualization | the **data-grid** component (never hand-roll a `<table>`) |
| A drag-and-drop board | the **kanban** component |
| Advanced column filtering, date range, tree, stepper, ... | the matching ReUI **component** |
| A single generic control already in shadcn (Button, Dialog, Select) | plain **shadcn** |
## Detailed references
- [rules/registry.md](./rules/registry.md) - the four types, the @reui registry, base/radix, free vs premium + license
- [rules/workflow.md](./rules/workflow.md) - the find -> install -> read-API -> adapt loop (most important)
- [rules/components.md](./rules/components.md) - the 17 components, the data-grid contract, base vs radix
- [rules/adapting.md](./rules/adapting.md) - reuse-first: preserve the design (no over-customizing), reuse examples + a block's own elements, real data, don't invent APIs
- [rules/craft.md](./rules/craft.md) - make it exceptional: point of view, hierarchy, density, states, responsive, motion, the bar
- [rules/quality.md](./rules/quality.md) - security, accessibility, and scroll gates (the done gate)
- [rules/styling.md](./rules/styling.md) - ReUI extended tokens, theme adaptation, density
- [rules/icons.md](./rules/icons.md) - portable icons, swapping imports, Motion Icons (static + animated)
- [tools.md](./tools.md) - the ReUI MCP: golden path, the 19 tools, token rules, result shapes, errors
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# Adapting installed ReUI code (reuse-first, no AI slop)
ReUI items ship production-quality. Your job is to **adapt by reuse** - wire real data and fit the app - not to redesign or hand-roll. The output should look like ReUI built it for this product.
## Preserve the design - don't over-customize
The design IS the product. A ReUI block/component encodes senior-designer decisions: spacing, hierarchy, density, color treatment, and component choices. The fastest way to turn a premium block back into generic AI slop is to "improve" its look - so don't.
- Change **data, copy, and props**; keep the **structure and styling** it ships with. Make the **smallest** change that wires the real data. If your diff touches `className` / JSX structure more than data / props, you are over-customizing - stop and reuse.
- Don't swap ReUI components for hand-rolled ones, restructure the layout, re-skin spacing / radius / colors, or add decorative chrome. Let the installed components carry the default spacing, radius, sizing, icon rhythm, density, and state styling; add custom Tailwind only when a component genuinely lacks a contract you need.
- Want a different look? `search` for a block whose design already fits and reuse that - don't restyle this one into a new design.
## Reuse the parts: examples and the block's own elements
- **Examples are building parts.** A free `c-*` example is a correct, single-pattern composition you can reuse. Before composing from scratch, `get_examples(component)`, install the closest one, and reuse its wiring - assemble UI from examples instead of hand-rolling what an example already shows.
- **Reuse a block's own elements.** Need more rows, cards, items, or sections than ship by default? Repeat the block's **existing** element by mapping real data through the same markup - never invent parallel markup that drifts from its design. Need a variant (empty / loading / expanded)? Derive it from an element the block already has.
## Don't invent (read, don't guess)
- Never write a prop, variant value, import path, or `@reui/...` name you didn't read in a component's inline `api`, an installed example, or a `search` result. If you didn't see it, treat it as nonexistent - call `get_component` / `get_examples` / `search` first, or run the MCP `validate_usage` tool to check planned names + props against the docs before writing code.
- If a getter returns `found: false` or `search` returns nothing, say so and fall back (plain shadcn, or ask) - never fabricate an install command or an API.
## What to change vs leave alone
- **Change:** the item's own data, copy, props, and layout to fit the app.
- **Leave alone:** installed component files, hooks, and the shared theme - do not edit vendored ReUI internals; change behavior through props and the documented API.
- Blocks are **portable React** - no `next/link`, `next/image`, or other framework-runtime imports inside them. Keep them portable.
## Demo data -> real data
- Replace every placeholder with the user's real data. Model it as **typed data structures** and **map over arrays** - never duplicate JSX per row/card. Keep small block-specific formatters next to the data.
- Wire the real source (columns, fields, fetch). For `data-grid`, implement the server fetch contract if the user needs server-side data.
- **Type from the component API, derive during render.** Type domain state through the component's own types - e.g. map status to `BadgeProps["variant"]` via a typed `Record<Status, …>` - instead of stringly-typed values. Compute view state during render; don't mirror derived data into `useState`/`useEffect`.
- **Adapt on the right base.** Use the API for the project's base (Base UI vs Radix - see [components.md](./components.md)); the installed files are already base-correct, so reuse their shape rather than translating from memory.
## Believable content (no AI tells)
- Use realistic labels, counts, timestamps, and statuses that map to a real workflow.
- No decorative buttons, fake tabs, meaningless toggles, equal-weight card walls, empty gradients, ornamental icons, or generic SaaS filler. Every element should do something.
## Operational surfaces (settings / profile / admin)
Pick ONE archetype and keep the family consistent: a vertical rail (3-6 sections), horizontal tabs (5-8), or a frame/stack. Prefer `frame` for tool-like surfaces, a card for profile-like ones. Don't mix archetypes in one surface.
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# CLI: registry setup, license, non-interactive install
## Registry setup (one-time, per project)
Free items (the 17 components and all `c-*` examples) need only the plain string registry in `components.json`:
```json
{ "registries": { "@reui": "https://reui.io/r/{style}/{name}.json" } }
```
Premium items (blocks; Motion Icons and templates) require a ReUI license at install:
1. Add the key to `.env.local`:
```bash
REUI_LICENSE_KEY=your-license-key
```
2. Switch `components.json` to the authenticated object form:
```json
{
"registries": {
"@reui": {
"url": "https://reui.io/r/{style}/{name}.json",
"headers": { "Authorization": "Bearer ${REUI_LICENSE_KEY}" }
}
}
}
```
The shadcn CLI expands `${REUI_LICENSE_KEY}` from `.env.local` inside `components.json`, but an MCP client config never expands variables, so a ReUI MCP server config must carry the raw token instead (for example `reui_pat_your_token_here`).
The MCP `get_project_context` tool returns the right config. Full guide: https://reui.io/docs/registry
## Installing
Use the project's package runner (check `packageManager`):
```bash
npx shadcn@latest add @reui/<name> --yes # npm
pnpm dlx shadcn@latest add @reui/<name> --yes # pnpm
bunx --bun shadcn@latest add @reui/<name> --yes # bun
```
`--yes` skips confirmation prompts. The CLI auto-detects the package manager from the lockfile (there is no `--package-manager` flag). It also resolves the correct base+style variant from `components.json`, so do not pass a style.
## Handling prompts and conflicts
- **Always pass `--yes`** so the CLI does not block on confirmation prompts.
- **Do NOT pass `--overwrite` by default.** If the CLI reports an existing file, read the output and resolve deliberately: install under a different name, adjust the path, or ask the user. Only use `--overwrite` when the user explicitly wants to replace a file.
- **Preview first when touching an existing project**: `npx shadcn@latest add @reui/<name> --dry-run` shows what would change; `--diff <file>` shows a specific file's diff. Use these before overwriting.
- Run from the **project root** so `components.json` and `.env.local` are found.
## Free vs premium boundary
- Public, no key: `c-*` examples and the 17 components (`@reui/data-grid`, `@reui/badge`, ...) that those examples depend on.
- Key required at install: blocks (`@reui/<category>-N`) need a Pro or Ultimate license; Motion Icons (`@reui/icons/...`) and templates need Ultimate.
If an install 401/403s, the license key is missing, invalid, or the plan does not cover that resource (blocks: Pro or higher; icons and templates: Ultimate). Point the user to https://reui.io/account (their key) or https://reui.io/pricing (upgrade).
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# ReUI components
The 19 ReUI building blocks: `alert`, `autocomplete`, `badge`, `data-grid`, `date-selector`, `event-calendar`, `filters`, `frame`, `gantt`, `icon-stack`, `kanban`, `number-field`, `phone-input`, `rating`, `scrollspy`, `sortable`, `stepper`, `timeline`, `tree`. Examples and blocks are composed from these.
**Rule one: never guess a component's API. Read it first.** Call **`get_component(name)`** for its inline `api` (props + usage, no web fetch), and **share the result's `docsUrl`** (the component's API documentation page) with the user whenever you work with that component's API, so they have the full reference (the `/llms.txt` index is a further fallback). Then call **`get_examples(name)`** to install a worked example and copy real composition. The contracts below are first-try orientation (required props, composition shape, the one gotcha); the inline `api` is the full reference. No single block fits? Compose: search the components you need, read each `get_component`, install a `get_examples` example per component, and adapt.
## data-grid (the flagship - read its API every time)
`data-grid` wraps TanStack Table v8. It is NOT a styled `<table>` and does NOT take `data`/`columns` props directly. The contract:
- Build a TanStack table instance with `useReactTable(...)` (columns, data, the feature models you need: sorting, pagination, row selection).
- Pass that instance to `<DataGrid table={table} recordCount={total}>`.
- Compose the body with `DataGridTable` inside `DataGrid`, and enable features through `tableLayout` (e.g. `{ headerSticky: true, columnsResizable: true }`), not ad-hoc classes.
- Server-side data uses the documented fetch shape (`recordCount` is the total for pagination).
```tsx
const table = useReactTable({
data,
columns,
getCoreRowModel: getCoreRowModel(),
// add sorting/pagination/selection models per the API
})
<DataGrid table={table} recordCount={data.length}>
<DataGridTable />
</DataGrid>
```
Common mistakes:
- **Incorrect:** `<DataGrid data={rows} columns={cols} />` - these props do not exist. **Correct:** build a `useReactTable` instance and pass `table={table}` + `recordCount`.
- **Incorrect:** a raw `<table>` / hand-rolled pagination. **Correct:** use `data-grid`; read its API for sticky header, pagination, virtualization, row selection.
- **Incorrect:** styling rows/cells with arbitrary classes. **Correct:** drive layout via `tableLayout` and the documented `ColumnMeta` (e.g. `cellClassName`, `headerTitle`).
## event-calendar
**Required:** events via `events`/`onEventsChange` (controlled) or `defaultEvents` (uncontrolled), plus a height on the root.
**Shape:**
```tsx
<EventCalendar defaultEvents={events} defaultView="month" className="h-[560px]">
<EventCalendarNav />
<EventCalendarContent />
</EventCalendar>
```
**Gotcha:** headless-first: `EventCalendarContent` renders the active view (month/week/day/days/agenda; a resource view activates when `resources` is passed) - there is no per-view JSX to compose. Events are `{ id, title, start, end (exclusive), allDay?, color?, recurrence?, resourceId? }`. Mutations flow through `onEventUpdate`/`canDropEvent` (return `false` to reject); the root needs an explicit height because it is a min-h-0 flex column.
## gantt
**Required:** `resources` (the left tree) plus bars via `events`/`defaultEvents` attached by `resourceId`.
**Shape:**
```tsx
<Gantt defaultEvents={bars} resources={tasks} defaultScale="month" className="h-[480px]">
<GanttNav />
<GanttView />
</Gantt>
```
**Gotcha:** bars move along the time axis only (never across rows) and are all-day spans with exclusive `end`; `progress` is 0-100. Scales are `day | week | month | quarter | year`. Zoom control, infinite scroll, summary rollups, and row checkboxes are ON by default - turn off what you do not need. Same `onEventUpdate`/`canDropEvent` commit pipeline as `event-calendar`; the root needs an explicit height.
## kanban
**Required:** `value` (`Record<string, T[]>`), `onValueChange`, `getItemValue`
**Shape:**
```tsx
<Kanban value={cols} onValueChange={setCols} getItemValue={(i) => i.id}>
<KanbanBoard>
{Object.entries(cols).map(([id, items]) => (
<KanbanColumn key={id} value={id}>
<KanbanColumnHandle><h3>{id}</h3></KanbanColumnHandle>
<KanbanColumnContent value={id}>
{items.map((i) => (
<KanbanItem key={i.id} value={i.id}>
<KanbanItemHandle>{i.title}</KanbanItemHandle>
</KanbanItem>
))}
</KanbanColumnContent>
</KanbanColumn>
))}
</KanbanBoard>
<KanbanOverlay><div className="bg-muted size-full rounded-md" /></KanbanOverlay>
</Kanban>
```
**Gotcha:** state is `Record<columnId, T[]>`. Each `KanbanColumnContent value` must match its parent `KanbanColumn value`. Omit `KanbanOverlay` and the drag preview silently breaks.
## sortable
**Required:** `value` (`T[]`), `onValueChange`, `getItemValue`
**Shape:**
```tsx
<Sortable value={items} onValueChange={setItems} getItemValue={(i) => i.id}>
{items.map((i) => (
<SortableItem key={i.id} value={i.id}>
<SortableItemHandle><GripVertical /></SortableItemHandle>
{i.label}
</SortableItem>
))}
</Sortable>
```
**Gotcha:** a flat 1D reorder list (not columns - that is `kanban`). `getItemValue` must return a stable, unique string. Pass `layout="grid"` or `layout="nested"` for non-list layouts.
## filters
**Required:** `filters` (`Filter[]`), `fields` (`FilterFieldConfig[]`), `onChange`
**Shape:**
```tsx
const [filters, setFilters] = useState<Filter[]>([
createFilter("priority", "is_any_of", ["low"]),
])
const fields: FilterFieldConfig[] = [
{ key: "priority", label: "Priority", type: "multiselect",
options: [{ value: "low", label: "Low" }, { value: "high", label: "High" }] },
]
<Filters filters={filters} fields={fields} onChange={setFilters} />
```
**Gotcha:** always build initial filters with `createFilter(field, operator, values)` - it generates the required `id`. Never hand-construct a `Filter` object. Pairs naturally with `data-grid`.
## date-selector
**Required:** none, but wire `onChange` to capture the value.
**Shape:**
```tsx
const [value, setValue] = useState<DateSelectorValue | undefined>()
<DateSelector value={value} onChange={setValue} label="Due date" />
```
**Gotcha:** the value is a structured `DateSelectorValue` (period / operator / start+end dates), NOT a `Date` - never pass a raw `Date`. Use `allowRange={false}` to lock single-date picking. Read `get_component("date-selector")` for the value shape.
## tree
**Required:** `tree` (a `@headless-tree/core` instance you construct)
**Shape:**
```tsx
<Tree tree={tree}>
{tree.getItems().map((item) => (
<TreeItem key={item.getId()} item={item}>
<TreeItemLabel />
</TreeItem>
))}
</Tree>
```
**Gotcha:** `Tree` is a styled shell - it takes a headless-tree instance via `tree`, NOT `data`/`items` props. Build the instance with `@headless-tree/react`. External API: https://headless-tree.lukasbach.com/
## stepper
**Required:** `StepperItem step` (number), `StepperContent value` (number)
**Shape:**
```tsx
<Stepper defaultValue={1}>
<StepperNav>
<StepperItem step={1}>
<StepperTrigger><StepperIndicator>1</StepperIndicator></StepperTrigger>
<StepperSeparator />
</StepperItem>
<StepperItem step={2}>
<StepperTrigger><StepperIndicator>2</StepperIndicator></StepperTrigger>
</StepperItem>
</StepperNav>
<StepperPanel>
<StepperContent value={1}>Step 1 content</StepperContent>
<StepperContent value={2}>Step 2 content</StepperContent>
</StepperPanel>
</Stepper>
```
**Gotcha:** steps are 1-indexed. Without `StepperPanel` + `StepperContent` you render the nav trail but no body. Put `StepperSeparator` in every `StepperItem` except the last.
## timeline
**Required:** `TimelineItem step` (number)
**Shape:**
```tsx
<Timeline>
<TimelineItem step={1}>
<TimelineHeader>
<TimelineDate>March 2024</TimelineDate>
<TimelineTitle>Project initialized</TimelineTitle>
</TimelineHeader>
<TimelineIndicator />
<TimelineSeparator />
<TimelineContent>Repo and architecture set up.</TimelineContent>
</TimelineItem>
</Timeline>
```
**Gotcha:** each item needs a unique `step`. `orientation` is `"vertical"` (default) or `"horizontal"`. This is a static event display, not interactive like `stepper`.
## autocomplete
**Required:** `items` (array; each item has at least `value`)
**Shape:**
```tsx
<Autocomplete items={items}>
<AutocompleteInput placeholder="Search..." />
<AutocompleteContent>
<AutocompleteEmpty>No results found.</AutocompleteEmpty>
<AutocompleteList>
{(item) => (
<AutocompleteItem key={item.value} value={item}>{item.label}</AutocompleteItem>
)}
</AutocompleteList>
</AutocompleteContent>
</Autocomplete>
```
**Gotcha:** `AutocompleteList` takes a render-prop `(item) => ReactNode`, NOT a mapped array of children. External API: https://base-ui.com/react/components/autocomplete
## phone-input
**Required:** none, but wire `onChange`.
**Shape:**
```tsx
<PhoneInput placeholder="Enter phone number" defaultCountry="US" value={value} onChange={setValue} />
```
**Gotcha:** `value`/`onChange` use an E.164 string (e.g. `"+14155551234"`), not a display-formatted string; `onChange` can fire `undefined`. `defaultCountry` is a 2-letter ISO code. Wraps `react-phone-number-input`.
## number-field
**Required:** wrap the controls in `NumberFieldGroup`.
**Shape:**
```tsx
<NumberField defaultValue={0}>
<NumberFieldScrubArea label="Quantity" />
<NumberFieldGroup>
<NumberFieldDecrement />
<NumberFieldInput />
<NumberFieldIncrement />
</NumberFieldGroup>
</NumberField>
```
**Gotcha:** import from `@/components/ui/number-field`. The accessible label goes on `NumberFieldScrubArea`, not `NumberField`. External API: https://base-ui.com/react/components/number-field
## rating
**Required:** `rating` (number)
**Shape:**
```tsx
<Rating rating={4.5} showValue editable onRatingChange={setRating} />
```
**Gotcha:** supports decimals (partial stars). Pass `editable` + `onRatingChange` for interactive input; omit both for a read-only display.
## scrollspy
**Required:** `targetRef` (the scroll container ref)
**Shape:**
```tsx
<Scrollspy targetRef={containerRef}>
<a href="#s1" data-scrollspy-anchor="s1">Section 1</a>
<a href="#s2" data-scrollspy-anchor="s2">Section 2</a>
</Scrollspy>
<div ref={containerRef}>
<div id="s1">...</div>
<div id="s2">...</div>
</div>
```
**Gotcha:** each link's `data-scrollspy-anchor` must match a section `id`. `targetRef` is the scrollable container (defaults to the window).
## frame
**Required:** `Frame` > `FramePanel`
**Shape:**
```tsx
<Frame>
<FramePanel>
<FrameHeader>
<FrameTitle>Title</FrameTitle>
<FrameDescription>Description</FrameDescription>
</FrameHeader>
<div className="p-5">Content</div>
<FrameFooter>Footer</FrameFooter>
</FramePanel>
</Frame>
```
**Gotcha:** a structured card shell for tool-like surfaces. `stacked` connects multiple panels with shared borders; `dense` removes panel padding; radius via the `--frame-radius` CSS variable.
## icon-stack
**Required:** one child icon
**Shape:**
```tsx
<IconStack aria-hidden="true">
<InboxIcon className="size-4" />
</IconStack>
```
**Gotcha:** isometric layered artwork for empty states and illustrations; style the inner icon via its own `className`. Mark purely decorative stacks `aria-hidden="true"` and keep the real label in surrounding copy.
## alert
**Required:** `Alert` > `AlertTitle`
**Shape:**
```tsx
<Alert variant="success">
<ShieldCheckIcon />
<AlertTitle>Security update</AlertTitle>
<AlertDescription>Enable two-factor authentication.</AlertDescription>
<AlertAction><Button size="xs">Update</Button></AlertAction>
</Alert>
```
**Gotcha:** shadcn-compatible API. `variant`: `default | destructive | info | success | warning | invert`. The non-default variants use ReUI extended color tokens (`--success`/`--info`/`--warning`/`--invert`), which the install adds. Defer generic alert rules to the shadcn skill.
## badge
**Required:** none (text child).
**Shape:**
```tsx
<Badge variant="success-light" size="sm">Success</Badge>
<Badge variant="outline" radius="full">Pill</Badge>
```
**Gotcha:** shadcn-compatible. Rich `variant` set (solid, `-outline`, `-light` per color), `size` `xs..xl`, `radius` `default | full`. Like `alert`, the color variants rely on ReUI extended tokens. Prefer `Badge` variants over raw color classes for statuses.
## base vs radix - write for the project's base
ReUI ships every component in two builds: `base` (Base UI) and `radix` (Radix UI). The install command and name are identical, and the CLI installs the build matching the project. But you must write/adapt code against the **right base**, because their APIs differ.
**Detect the base first.** Read `components.json` -> `style` and take the segment before the first `-`:
- `"style": "base-nova"` -> **Base UI**
- `"style": "radix-nova"` -> **Radix UI**
**Then use that base's API.** The deltas mirror shadcn's base-vs-radix split:
- Slot/composition: Base UI `render={<… />}` vs Radix `asChild`.
- `Select`: Base UI takes `items`; Radix uses `<SelectItem>` children.
- `ToggleGroup`: Base UI `multiple` boolean vs Radix `type="single" | "multiple"`.
The safest path is to **read the installed files and `c-*` examples** - they're already in your base, so reuse their wiring instead of guessing. When `get_component`'s inline `api` or an example shows the other base's shape, translate it to your base (or `validate_usage` to confirm). Defer the generic base/radix mechanics to the shadcn skill.
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# Craft: make ReUI UI exceptional, not generic
ReUI items ship senior-designer quality. Your adaptation has to hold that bar, so the result reads like a real product surface a team would keep - not a wireframe an AI generated. Use these alongside the reuse rules in [adapting.md](./adapting.md).
## Have a point of view
Pick an emotional register before you compose - calm, operational, premium, editorial, dense, energetic - and let layout, spacing, surface treatment, and icon behavior all reinforce it. One or two memorable decisions and restraint everywhere else beats ten generic ones. UI with no point of view reads as generated.
## Brutally clear hierarchy
One focal point per card or panel: the dominant metric or task first, its label second, supporting detail third. The first thing the eye lands on should be the right thing; secondary text must read as secondary. Borders, separators, and surfaces do real work to create 2-3 information bands - don't flatten everything to equal weight.
## Spacing rhythm and deliberate density
Gaps are a signal, not a default. Keep them intentional and consistent within a family (`gap-1`/`gap-2` for tight operational rows, larger gaps for section breaks), and smaller within a group than between groups. Match the surrounding ReUI density; don't pad an operational surface like a marketing page, and don't drift density mid-section. The composition should still feel authored in grayscale.
## Cover the real states (the usual miss)
A surface isn't done at the happy path. Compose, and wire:
- **Empty** - a purposeful empty state (short message + the primary action), never a blank panel.
- **Loading** - a **skeleton** that matches the real layout, not a centered spinner.
- **Error** - an inline, recoverable error with a retry, announced via `role="status"`/`aria-live`.
Derive these from an element the block already has (don't invent parallel markup), or `get_examples` for a state-specific example.
## Responsive by default
Mobile-first, not mobile-afterthought. In constrained rows/cards/sidebars, put `min-w-0` on the shrinking container and `truncate` long single-line labels; protect the primary label's width and let secondary content compress. Reflow layouts (multi-column -> single column) rather than just shrinking them. Desktop and mobile should both look designed.
## Motion, subtly
Motion should clarify, not decorate. Use ReUI Motion Icons on primary actions for a subtle hover cue; keep transitions short (~200-300ms) with calm easing; prefer a skeleton pulse over a spinner. No bouncing, no gratuitous entrance animations on every element.
## Real, activated content
Use believable, typed data (realistic labels, counts, timestamps, statuses that map to a real workflow) - never lorem or abstract filler. Every visible control does something: no decorative buttons, fake tabs, meaningless toggles, or stats with no job. It must still hold with long names, empty values, and crowded data.
## Avoid the AI tells
These instantly read as generated - don't ship them: equal-weight card walls, empty gradients, repetitive padding everywhere, generic enterprise copy, ornamental icons, and number tiles that don't earn their place.
## The bar
Before you finish, ask: **would a product team keep this instead of replacing it? Does it still feel strong after swapping in real content?** If not, reuse the shipped ReUI design harder - don't restyle it into something new - then run the [quality.md](./quality.md) gates.
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# Icons (ReUI delta over shadcn)
Follow the shadcn icon rules (use the project's configured `iconLibrary`, `data-icon` on icons inside `Button`, no sizing classes on icons inside components, pass icons as component objects not string keys). ReUI adds the following.
## Portable icons (library-agnostic)
ReUI components, examples, and blocks are authored to be icon-library-agnostic. When `iconLibrary` is set in `components.json`, the shadcn CLI installs each item's icons in **your** library automatically - you swap nothing. If an installed item's icons don't match your project (for example `iconLibrary` isn't set, so they came in from the item's demo library), change the **import source and component name** to your library, keeping the same icon-name semantics:
- `lucide` -> `lucide-react`
- `tabler` -> `@tabler/icons-react`
- `phosphor` -> `@phosphor-icons/react`
- `remix` -> `@remixicon/react`
- `hugeicons` -> `@hugeicons/react`
Don't assume `lucide-react`; read `iconLibrary` from `components.json`.
## Keep icons purposeful
Icons support the hierarchy, they don't replace it: keep them small, matched to the surrounding density, and decorative ones `aria-hidden="true"` (an icon-only control still needs an accessible label on the control). Don't add ornamental icons that do no job.
## Motion Icons (the `@reui/icons/...` set)
ReUI ships its own icon set in 4 styles (outline, solid, duotone, filled), each icon in two variants:
```bash
npx shadcn@latest add @reui/icons/default/<style>/<name> --yes # static
npx shadcn@latest add @reui/icons/animated/<style>/<name> --yes # hover-animated (motion/react)
```
Finding them via the MCP is free; installing requires an Ultimate license (`REUI_LICENSE_KEY`, see [cli.md](./cli.md)). Reach for a Motion Icon on a primary action when a subtle hover cue helps; keep motion restrained.
Finding icons:
- Several icons (the common case): **`search_icons(concepts[])`** - up to 24 concepts in one call, the best icons per concept with install commands. Pass `animated: true` to get only icons with a hover-animated Motion variant.
- One icon: `search` with `type: "icon"`.
- Icon results and `get_icon` carry `animated: true` and `installAnimated` when an animated variant exists - use those install strings, do not construct paths by hand.
- Every icon result carries a `previewUrl` (its live icon-category page) - **share it with the user** so they can SEE the icon before installing.
The `icon-stack` component composes multiple icons into a stacked display.
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# Quality gates (security, accessibility, scroll)
These are the **done gate**, not a nice-to-have: before you call any ReUI work finished, call the MCP `get_audit_checklist` tool and pass every item below (plus the craft bar in [craft.md](./craft.md)). Then typecheck and lint.
## Security
- Never `dangerouslySetInnerHTML`. Render data as text/components.
- External links (`target="_blank"`) must always pair `rel="noopener noreferrer"`.
- No real PII, secrets, or tokens in demo or committed code. Remote media only from sources the project already allows.
## Accessibility
- Implicit list/card items that navigate get real anchors with a standard hover affordance.
- Icon-only or numeric buttons need an `aria-label`; decorative icons get `aria-hidden`.
- Every non-submit button is `type="button"`.
- Keyboard + focus: everything interactive is reachable in a sensible Tab order with a visible focus ring; layers (dialogs/sheets/menus) trap focus and close on `Escape`. ReUI components ship standard keyboard behavior - read each component's inline `api` rather than re-implementing it.
- Announce async UI: loading and error messages use `role="status"` / `aria-live` so they're not silent to screen readers.
## Scroll mechanics
- Make scroll regions with a parent-owned height: a `min-h-0` + flex chain down to the scroll container. Never guess a `max-h`.
- The scroll container owns `overflow-auto`; ancestors stay `min-h-0` so the height resolves.
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# ReUI registry structure
ReUI is a shadcn-compatible registry with four entity types. **Examples and blocks are built FROM components** - reuse them, don't rebuild.
- **component** - one of the 17 ReUI building blocks with a real API (`data-grid`, `kanban`, `filters`, `date-selector`, `tree`, ...). Install directly (`@reui/data-grid`) or let it come in as a dependency of an example/block. Free. Read its API with `get_component(name)`.
- **example** - a free `c-*` single-pattern use-case of a component (`c-kanban-1`, `c-data-grid-3`). Install one and read it to copy real composition. Find a component's examples with `get_examples(name)`.
- **block** - a premium, full-page section that composes several components (`data-grid-2`, `pricing-page-1`). Pro or Ultimate license at install. Adapts to your active theme via semantic tokens.
- **icon** - Motion Icons in 4 styles (outline, solid, duotone, filled), static (`@reui/icons/default/<style>/<name>`) and hover-animated (`@reui/icons/animated/<style>/<name>`). Ultimate license at install. See [icons.md](./icons.md).
## The @reui registry
Install everything through the shadcn CLI: `npx shadcn@latest add @reui/<name> --yes`. The CLI reads the `@reui` registry from the project's `components.json`. Free items need only the plain string form:
```json
{ "registries": { "@reui": "https://reui.io/r/{style}/{name}.json" } }
```
Premium installs need the authenticated form + `REUI_LICENSE_KEY` in `.env.local` - see [cli.md](./cli.md). The MCP `get_project_context` tool returns the right config.
## Know your base: base or radix
ReUI ships every item in two builds - `base` (Base UI) and `radix` (Radix UI) - with mirrored names. The CLI installs the build matching your project automatically, but **you must write code against the right base's API**. Detect it from `components.json` -> `style`: the segment before the first `-` is the base (`base-nova` -> Base UI, `radix-nova` -> Radix UI). The installed files and `c-*` examples are already in your base - read them and adapt on that base. See [components.md](./components.md) for the API deltas.
**So the MCP's own `docsUrl` and `previewUrl` match your base**, send your `style` to the MCP: add `?style=<your components.json style>` to the ReUI MCP server URL (or set an `X-Reui-Style` header) in your MCP client config - set once, applies to every call. The MCP then resolves docs/preview links to YOUR library (`/docs/components/radix/...`, `/preview/radix/...` for a radix project) instead of the default base; `get_project_context` echoes back the style it currently sees so you can confirm it. Install commands are unaffected (the CLI already installs the right variant). If you notice the MCP returning `base` links for a `radix` project, tell the user to add `?style=` to the server URL.
Blocks adapt to your active theme through semantic tokens and CSS variables - change the theme and every block follows.
## Free vs premium
- **Free, no key:** the 17 components, all `c-*` examples, the ReUI MCP, and this skill.
- **Premium, license required at install:** blocks (Pro or Ultimate), Motion Icons and templates (Ultimate). Set `REUI_LICENSE_KEY` (see [cli.md](./cli.md)).
## Component API index
The canonical index of every component's API docs is **https://reui.io/llms.txt** (returned as `componentsApiUrl` in MCP results). Prefer the inline `api` from `get_component`; use the index/docs as the fallback.
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# Styling (ReUI delta over shadcn)
Follow the shadcn skill for the generic rules (semantic colors not raw values, `gap-*` not `space-y-*`, `size-*`, `cn()`, no manual `dark:` overrides, no overlay `z-index`). This file is only the ReUI-specific additions.
## ReUI extended semantic tokens
ReUI adds semantic tokens beyond shadcn's base set. Use these instead of raw colors for status and emphasis:
- `--success` / `--success-foreground`
- `--info` / `--info-foreground`
- `--warning` / `--warning-foreground`
- `--destructive-foreground` (paired with shadcn's `--destructive`)
- `--invert` / `--invert-foreground` (inverted surfaces)
Use them as Tailwind utilities (`bg-success text-success-foreground`, `text-warning`, ...). They are defined in the project's global CSS and registered with Tailwind (`@theme inline` on v4). If a token is missing in the project, add it to the global CSS file (never a new file) following the same `name` / `name-foreground` convention, exactly as the shadcn customization rules describe.
**Incorrect:** `<span className="text-green-600">Active</span>`
**Correct:** `<Badge variant="success">Active</Badge>` or `<span className="text-success">Active</span>`
## Blocks follow your theme
When you install a block it adapts to your active theme through the semantic tokens above and the project's CSS variables. Don't hardcode style-specific values into installed block code and don't fork it to "restyle" - change the theme via the CSS variables / a preset and every block follows. Want a different look? `search` for a block whose design already fits instead of re-skinning one.
## Density and typography rhythm
ReUI operational UI usually feels dense, not airy. Keep the gap between a title and its supporting description tight by default (`gap-0.5`, `space-y-1`, or `space-y-px`), and smaller than the gap between sections. Match the surrounding ReUI density when you add rows or fields; do not pad operational surfaces like a marketing page.
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# Workflow: find -> install -> read API -> adapt
The core ReUI loop. The MCP tells you what to install and gives you the API; the shadcn CLI installs it; you turn the installed files into correct, themed, data-wired code by **reuse**, not redesign.
## 1. Find (ReUI MCP `search` / `compose_page`)
**Full multi-section page ask?** Call `compose_page(intent, sections?)` FIRST, before searching block-by-block. It returns ordered sections, each with the best block for the intent (top pick + alternates); sections listed in `unavailableSections` have no real inventory - compose those from components, do not force a bad block.
For everything else, call `search` with the user's intent. Pass structured hints whenever you can infer them - you are an LLM, so do the parsing the server cannot:
- `type`: `"component"` (one of the 17 building blocks), `"example"` (a c-\* use-case), `"block"` (a full page/section), `"icon"`.
- `component`: the ReUI component the request implies (`"data-grid"`, `"kanban"`, ...).
- `category`, `features` (e.g. `["sortable","pagination"]`), `free`.
Example: "build a users management page with filters" -> `search({ query: "users management page with filters", type: "block", component: "data-grid", features: ["filters"] })`.
Each result has `install`, `previewUrl`, `docsUrl`, `componentsUsed`, `score`, `termCoverage`, and `whyMatch`. `score` is relative to the top hit (the top is ~100 by construction), not an absolute quality - compare results to each other, and show the user the top options if several score closely; do not silently guess. A low `termCoverage` means a weak match even with a high score - rephrase or widen.
**Always show the preview link.** Whenever you list or recommend items - from `search`, `search_icons`, `list_components`, `compose_page`, or a getter - include each item's `previewUrl` (a live preview page) so the user can SEE it before you install. Blocks and examples link to an individual live preview; icons and components to their live category/component page. This applies to every listing, not only a single pick.
## 2. Install (shadcn CLI)
Run the result's `install` command from the project root, non-interactively:
```bash
npx shadcn@latest add @reui/<name> --yes
```
The CLI reads `components.json`, installs the correct base+style variant, resolves `registryDependencies` (a block pulls in its components), installs npm deps, and rewrites aliases. Do not pass the base/style. See [cli.md](./cli.md).
## 3. Read the API (do not guess props)
Before writing code against any component an item uses:
1. The item's `componentDigests` already give a 1-line contract per component - often enough to wire it. For the full API, call **`get_component(names)`** with ALL of `componentsUsed` in ONE call (it accepts an array) and read each inline `api` - no web fetch. **Share the component's `docsUrl`** (its API documentation page) with the user whenever you work with that component's API, so they have the full reference; the `/llms.txt` index is a further fallback.
2. Call **`get_examples(name)`** for the free `c-*` examples of that component; install one and **read the added files** to copy the exact composition. This is the fastest correct path - the example shows real wiring you adapt, not invent.
3. About to write a prop you did not see in an `api` or installed file? Run **`validate_usage`** BEFORE writing the code - per-prop documented / notDocumented verdicts plus did-you-mean suggestions. notDocumented means read the API, not push on.
## 4. Adapt (reuse-first) - do not skip
Installing files is not the end, and redesigning them defeats the point. First note the project's **base** so you write the right API - read `components.json` -> `style` and take the segment before the first `-` (`base-nova` -> Base UI, `radix-nova` -> Radix UI), see [components.md](./components.md). After `add`:
1. **Read the added files**; keep the composition intact. For a block, verify the components are wired correctly (for `data-grid`: a `useReactTable` instance passed as `table`, `recordCount` set - see [components.md](./components.md)).
2. **Replace demo data with the user's real data** via typed structures (see [adapting.md](./adapting.md)).
3. **Fix icon imports** to the project's icon library (see [icons.md](./icons.md)).
4. **Align styling** to semantic tokens and the active theme - no raw colors (see [styling.md](./styling.md)).
5. **Validate before finalizing**: if your adaptation introduced components or props you did not read in an `api` or example, run `validate_usage` on them.
6. **Hit the craft bar** - clear hierarchy, deliberate density, the empty / loading / error states, subtle motion, and mobile-first responsiveness (see [craft.md](./craft.md)). Generic-looking output means you under-reused the design, not that it needs restyling.
7. **Pass the quality gates** (security, a11y, scroll) - call the MCP `get_audit_checklist` tool and clear every item (see [quality.md](./quality.md)).
8. **Typecheck / lint**.
## If no single block fits
Compose from components (`compose_page` tells you which sections have no block inventory via `unavailableSections`). `search` the components you need, read each `get_component` API, install a worked `get_examples` example for each, and assemble by adapting those examples. A block in the same category is a useful reference - install it and read its files to see how ReUI composes those components, then adapt.
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# ReUI MCP: full reference
The ReUI MCP (`https://mcp.reui.io`, Streamable HTTP) is free to use but needs a ReUI account: on first use the agent signs in with ReUI (a free account is created if the user has none), so every request is tied to an account. Free covers components and examples; a Pro or Ultimate license unlocks premium blocks and Motion Icons and removes the daily request limit. It does **discovery + guidance** (search, inline APIs, page planning, validation) and never serves source; the shadcn CLI does **installation**, and the license key lives there (the `@reui` entry in `components.json`, backed by `.env.local`). Goal: from the user's intent to correct, themed, data-wired ReUI code in the **fewest tokens and calls**, with **no guessing**.
## Golden path (token-optimal - follow this order)
Most tasks need 2-4 MCP calls and ZERO web fetches:
1. **`search(query, ...hints)`** -> pick the top 1-3 results. Each result already carries `install`, `previewUrl`, `docsUrl`, `componentsUsed`, `score`, `whyMatch`. The payload is complete - do not call another tool just to "confirm" a result.
2. **`get_component([...componentsUsed])`** in ONE batched call (one name or an array of up to 20) -> read each inline `api`. This **replaces** fetching docs pages. Often skippable: search responses carry `componentDigests`, a compact API contract per referenced component.
3. **`get_examples(component)`** -> install ONE returned `c-*` example, read the added files, copy the composition.
4. **`get_install_command(item)`** only to validate a name you are unsure of (results already include `install`). Run the install with the shadcn CLI (`--yes`).
5. **`get_audit_checklist()`** before declaring done.
If you already know the exact item name, skip `search`. Everything else is situational.
## The 5 task-specific tools (when to reach for each)
- **`compose_page`** - BEFORE building any full page (dashboard, settings, billing, landing). Pass the intent (and optionally the sections you want); it returns ordered sections, each with the best premium block for the intent (top pick + alternates). Sections with no real inventory are listed honestly in `unavailableSections` - compose those from components instead of forcing a bad block.
- **`search_icons`** - whenever you need icons, especially several. Batch up to 24 concepts in one call; each concept returns its best icons with install commands. Pass `animated: true` to get only icons that have a hover-animated Motion variant.
- **`validate_usage`** - BEFORE writing code with component names or props you have not read in an inline `api` or an installed example. It checks planned names + props against the indexed API docs and registry item names; returns did-you-mean suggestions and per-prop documented / notDocumented verdicts. Deterministic, no inference - a notDocumented prop means stop and read the API, not push on.
- **`whats_new`** - when your registry knowledge might be stale (a name 404s, the user mentions an item you don't know). Returns items added/removed per build, newest first.
- **`report_issue`** - when an installed item is actually broken (bad source, wrong dependency, broken preview). Goes straight to the ReUI team; rate-limited 5/hour. Not for usage questions.
## All 19 tools
`search`, `get_block`, `get_example`, `get_icon`, `list_block_groups`, `list_block_categories`, `list_example_categories`, `list_icon_categories`, `list_components`, `get_component`, `get_examples`, `search_icons`, `compose_page`, `validate_usage`, `whats_new`, `report_issue`, `get_install_command`, `get_project_context`, `get_audit_checklist`. The MCP serves the full parameter schemas; do not guess parameters beyond them.
## Token + speed rules
- **Batch `get_component`** - ONE call with the whole `componentsUsed` array, never N calls. Skip it entirely when `componentDigests` already answers the question.
- **Read source by installing** - the MCP serves no source. To read or analyze an item's real code, install it with the shadcn CLI and open the local files. Learn an API from the inline `api` / `componentDigests`, never by reading raw source.
- **Infer `search` hints yourself** (`type`, `component`, `category`, `features`, `free`) - hints shrink the result set and the tokens. Keep `limit` low; one right result beats ten.
- Run independent calls (and the shadcn install) concurrently in one turn - serial tool calls are the main source of slowness.
- Don't repeat a search for the same intent; don't call `list_*` to "see everything" - `search` is the entry point, `list_*` is only for browsing a taxonomy the user explicitly wants to explore.
- Prefer `get_component`'s inline `api` over `docsUrl` / `/llms.txt`. Fetch a web page only as a last resort.
## Result shapes (so you don't re-fetch)
- `score` is 0-100 RELATIVE to the top hit (the top is ~100 by construction), not absolute - compare results to each other.
- `termCoverage` (0-1) is the share of the query the item matched - low means a weak match even if the score looks high; rephrase or widen the search.
- Each result carries `whyMatch`, `install`, docs/preview URLs, and a `free` flag; premium items carry `requiredPlan` (`"pro"` for blocks, `"ultimate"` for icons).
- `componentDigests` is a top-level map: a compact API contract per referenced component - often enough to wire an item without a `get_component` call.
- Icon results and `get_icon` include `animated: true` and `installAnimated` when a hover-animated Motion variant exists (animated: `@reui/icons/animated/<style>/<name>`; static: `@reui/icons/default/<style>/<name>`).
## Error playbook
- **401** - the MCP requires a signed-in ReUI account. The client prompts "Sign in with ReUI" (OAuth) on first use; a free account is created if needed. For headless/CI, pass a personal token (`reui_pat_...`, created at https://reui.io/account/mcp) as `Authorization: Bearer`.
- **403 / locked result** - a valid account but the plan does not cover the item: premium blocks need Pro, Motion Icons need Ultimate. Point to https://reui.io/pricing (upgrade). Free accounts still get all components + examples.
- **429** - rate limited (120 requests/min per IP); back off, honor `Retry-After`.
- **not found** (`found: false`) - use the returned `suggestions`, or `search`; check `whats_new` if you suspect a stale name. Never run a fabricated install command.
## Fallbacks
- No ReUI MCP: `npx shadcn@latest search @reui -q "..."` then `add` (generic, no scoring / inline API).
- The shadcn project's own MCP also works over the `@reui` registry: https://ui.shadcn.com/docs/mcp.
Per-agent MCP setup: https://reui.io/docs/mcp
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---
name: shadcn
description: Manages shadcn components and projects — adding, searching, fixing, debugging, styling, and composing UI. Provides project context, component docs, and usage examples. Applies when working with shadcn/ui, component registries, presets, --preset codes, or any project with a components.json file. Also triggers for "shadcn init", "create an app with --preset", or "switch to --preset".
user-invocable: false
allowed-tools: Bash(npx shadcn@latest *), Bash(pnpm dlx shadcn@latest *), Bash(bunx --bun shadcn@latest *)
---
# shadcn/ui
A framework for building ui, components and design systems. Components are added as source code to the user's project via the CLI.
> **IMPORTANT:** Run all CLI commands using the project's package runner: `npx shadcn@latest`, `pnpm dlx shadcn@latest`, or `bunx --bun shadcn@latest` — based on the project's `packageManager`. Examples below use `npx shadcn@latest` but substitute the correct runner for the project.
## Current Project Context
```json
!`npx shadcn@latest info --json`
```
The JSON above contains the project config and installed components. Use `npx shadcn@latest docs <component>` to get documentation and example URLs for any component.
## Principles
1. **Use existing components first.** Use `npx shadcn@latest search` to check registries before writing custom UI. Check community registries too.
2. **Compose, don't reinvent.** Settings page = Tabs + Card + form controls. Dashboard = Sidebar + Card + Chart + Table.
3. **Use built-in variants before custom styles.** `variant="outline"`, `size="sm"`, etc.
4. **Use semantic colors.** `bg-primary`, `text-muted-foreground` — never raw values like `bg-blue-500`.
## Critical Rules
These rules are **always enforced**. Each links to a file with Incorrect/Correct code pairs.
### Styling & Tailwind → [styling.md](./rules/styling.md)
- **`className` for layout, not styling.** Never override component colors or typography.
- **No `space-x-*` or `space-y-*`.** Use `flex` with `gap-*`. For vertical stacks, `flex flex-col gap-*`.
- **Use `size-*` when width and height are equal.** `size-10` not `w-10 h-10`.
- **Use `truncate` shorthand.** Not `overflow-hidden text-ellipsis whitespace-nowrap`.
- **No manual `dark:` color overrides.** Use semantic tokens (`bg-background`, `text-muted-foreground`).
- **Use `cn()` for conditional classes.** Don't write manual template literal ternaries.
- **No manual `z-index` on overlay components.** Dialog, Sheet, Popover, etc. handle their own stacking.
### Forms & Inputs → [forms.md](./rules/forms.md)
- **Forms use `FieldGroup` + `Field`.** Never use raw `div` with `space-y-*` or `grid gap-*` for form layout.
- **`InputGroup` uses `InputGroupInput`/`InputGroupTextarea`.** Never raw `Input`/`Textarea` inside `InputGroup`.
- **Buttons inside inputs use `InputGroup` + `InputGroupAddon`.**
- **Option sets (27 choices) use `ToggleGroup`.** Don't loop `Button` with manual active state.
- **`FieldSet` + `FieldLegend` for grouping related checkboxes/radios.** Don't use a `div` with a heading.
- **Field validation uses `data-invalid` + `aria-invalid`.** `data-invalid` on `Field`, `aria-invalid` on the control. For disabled: `data-disabled` on `Field`, `disabled` on the control.
### Component Structure → [composition.md](./rules/composition.md)
- **Items always inside their Group.** `SelectItem``SelectGroup`. `DropdownMenuItem``DropdownMenuGroup`. `CommandItem``CommandGroup`.
- **Use `asChild` (radix) or `render` (base) for custom triggers.** Check `base` field from `npx shadcn@latest info`. → [base-vs-radix.md](./rules/base-vs-radix.md)
- **Dialog, Sheet, and Drawer always need a Title.** `DialogTitle`, `SheetTitle`, `DrawerTitle` required for accessibility. Use `className="sr-only"` if visually hidden.
- **Use full Card composition.** `CardHeader`/`CardTitle`/`CardDescription`/`CardContent`/`CardFooter`. Don't dump everything in `CardContent`.
- **Button has no `isPending`/`isLoading`.** Compose with `Spinner` + `data-icon` + `disabled`.
- **`TabsTrigger` must be inside `TabsList`.** Never render triggers directly in `Tabs`.
- **`Avatar` always needs `AvatarFallback`.** For when the image fails to load.
### Use Components, Not Custom Markup → [composition.md](./rules/composition.md)
- **Use existing components before custom markup.** Check if a component exists before writing a styled `div`.
- **Callouts use `Alert`.** Don't build custom styled divs.
- **Empty states use `Empty`.** Don't build custom empty state markup.
- **Toast via `sonner`.** Use `toast()` from `sonner`.
- **Use `Separator`** instead of `<hr>` or `<div className="border-t">`.
- **Use `Skeleton`** for loading placeholders. No custom `animate-pulse` divs.
- **Use `Badge`** instead of custom styled spans.
### Icons → [icons.md](./rules/icons.md)
- **Icons in `Button` use `data-icon`.** `data-icon="inline-start"` or `data-icon="inline-end"` on the icon.
- **No sizing classes on icons inside components.** Components handle icon sizing via CSS. No `size-4` or `w-4 h-4`.
- **Pass icons as objects, not string keys.** `icon={CheckIcon}`, not a string lookup.
### CLI
- **Never decode preset codes or build preset URLs manually.** Use `npx shadcn@latest preset decode <code>`, `preset url <code>`, or `preset open <code>`. For project-aware preset detection, use `npx shadcn@latest preset resolve`.
- **Apply preset codes directly with the CLI.** Use `npx shadcn@latest apply <code>` for existing projects, or `npx shadcn@latest init --preset <code>` when initializing.
## Key Patterns
These are the most common patterns that differentiate correct shadcn/ui code. For edge cases, see the linked rule files above.
```tsx
// Form layout: FieldGroup + Field, not div + Label.
<FieldGroup>
<Field>
<FieldLabel htmlFor="email">Email</FieldLabel>
<Input id="email" />
</Field>
</FieldGroup>
// Validation: data-invalid on Field, aria-invalid on the control.
<Field data-invalid>
<FieldLabel>Email</FieldLabel>
<Input aria-invalid />
<FieldDescription>Invalid email.</FieldDescription>
</Field>
// Icons in buttons: data-icon, no sizing classes.
<Button>
<SearchIcon data-icon="inline-start" />
Search
</Button>
// Spacing: gap-*, not space-y-*.
<div className="flex flex-col gap-4"> // correct
<div className="space-y-4"> // wrong
// Equal dimensions: size-*, not w-* h-*.
<Avatar className="size-10"> // correct
<Avatar className="w-10 h-10"> // wrong
// Status colors: Badge variants or semantic tokens, not raw colors.
<Badge variant="secondary">+20.1%</Badge> // correct
<span className="text-emerald-600">+20.1%</span> // wrong
```
## Component Selection
| Need | Use |
| -------------------------- | --------------------------------------------------------------------------------------------------- |
| Button/action | `Button` with appropriate variant |
| Form inputs | `Input`, `Select`, `Combobox`, `Switch`, `Checkbox`, `RadioGroup`, `Textarea`, `InputOTP`, `Slider` |
| Toggle between 25 options | `ToggleGroup` + `ToggleGroupItem` |
| Data display | `Table`, `Card`, `Badge`, `Avatar` |
| Navigation | `Sidebar`, `NavigationMenu`, `Breadcrumb`, `Tabs`, `Pagination` |
| Overlays | `Dialog` (modal), `Sheet` (side panel), `Drawer` (bottom sheet), `AlertDialog` (confirmation) |
| Feedback | `sonner` (toast), `Alert`, `Progress`, `Skeleton`, `Spinner` |
| Command palette | `Command` inside `Dialog` |
| Charts | `Chart` (wraps Recharts) |
| Layout | `Card`, `Separator`, `Resizable`, `ScrollArea`, `Accordion`, `Collapsible` |
| Empty states | `Empty` |
| Menus | `DropdownMenu`, `ContextMenu`, `Menubar` |
| Tooltips/info | `Tooltip`, `HoverCard`, `Popover` |
## Key Fields
The injected project context contains these key fields:
- **`aliases`** → use the actual alias prefix for imports (e.g. `@/`, `~/`), never hardcode.
- **`isRSC`** → when `true`, components using `useState`, `useEffect`, event handlers, or browser APIs need `"use client"` at the top of the file. Always reference this field when advising on the directive.
- **`tailwindVersion`** → `"v4"` uses `@theme inline` blocks; `"v3"` uses `tailwind.config.js`.
- **`tailwindCssFile`** → the global CSS file where custom CSS variables are defined. Always edit this file, never create a new one.
- **`style`** → component visual treatment (e.g. `nova`, `vega`).
- **`base`** → primitive library (`radix` or `base`). Affects component APIs and available props.
- **`iconLibrary`** → determines icon imports. Use `lucide-react` for `lucide`, `@tabler/icons-react` for `tabler`, etc. Never assume `lucide-react`.
- **`resolvedPaths`** → exact file-system destinations for components, utils, hooks, etc.
- **`framework`** → routing and file conventions (e.g. Next.js App Router vs Vite SPA).
- **`packageManager`** → use this for any non-shadcn dependency installs (e.g. `pnpm add date-fns` vs `npm install date-fns`).
- **`preset`** → resolved preset code and values for the current project. Use `npx shadcn@latest preset resolve --json` when you only need preset information.
See [cli.md — `info` command](./cli.md) for the full field reference.
## Component Docs, Examples, and Usage
Run `npx shadcn@latest docs <component>` to get the URLs for a component's documentation, examples, and API reference. Fetch these URLs to get the actual content.
```bash
npx shadcn@latest docs button dialog select
```
**When creating, fixing, debugging, or using a component, always run `npx shadcn@latest docs` and fetch the URLs first.** This ensures you're working with the correct API and usage patterns rather than guessing.
## Workflow
1. **Get project context** — already injected above. Run `npx shadcn@latest info` again if you need to refresh.
2. **Check installed components first** — before running `add`, always check the `components` list from project context or list the `resolvedPaths.ui` directory. Don't import components that haven't been added, and don't re-add ones already installed.
3. **Find components**`npx shadcn@latest search`.
4. **Get docs and examples** — run `npx shadcn@latest docs <component>` to get URLs, then fetch them. Use `npx shadcn@latest view` to browse registry items you haven't installed. To preview changes to installed components, use `npx shadcn@latest add --diff`.
5. **Install or update**`npx shadcn@latest add`. When updating existing components, use `--dry-run` and `--diff` to preview changes first (see [Updating Components](#updating-components) below).
6. **Fix imports in third-party components** — After adding components from community registries (e.g. `@bundui`, `@magicui`), check the added non-UI files for hardcoded import paths like `@/components/ui/...`. These won't match the project's actual aliases. Use `npx shadcn@latest info` to get the correct `ui` alias (e.g. `@workspace/ui/components`) and rewrite the imports accordingly. The CLI rewrites imports for its own UI files, but third-party registry components may use default paths that don't match the project.
7. **Review added components** — After adding a component or block from any registry, **always read the added files and verify they are correct**. Check for missing sub-components (e.g. `SelectItem` without `SelectGroup`), missing imports, incorrect composition, or violations of the [Critical Rules](#critical-rules). Also replace any icon imports with the project's `iconLibrary` from the project context (e.g. if the registry item uses `lucide-react` but the project uses `hugeicons`, swap the imports and icon names accordingly). Fix all issues before moving on.
8. **Registry must be explicit** — When the user asks to add a block or component, **do not guess the registry**. If no registry is specified (e.g. user says "add a login block" without specifying `@shadcn`, `@tailark`, `owner/repo`, etc.), ask which registry to use. Never default to a registry on behalf of the user.
9. **Switching presets** — Ask the user first: **overwrite**, **partial**, **merge**, or **skip**?
- **Inspect current preset**: `npx shadcn@latest preset resolve`. Use `--json` when you need structured values.
- **Inspect incoming preset**: `npx shadcn@latest preset decode <code>`. Use `preset url <code>` or `preset open <code>` to share or open the preset builder.
- **Overwrite**: `npx shadcn@latest apply <code>`. Overwrites detected components, fonts, and CSS variables.
- **Partial**: `npx shadcn@latest apply <code> --only theme,font`. Updates only the selected preset parts without reinstalling UI components. Supported values are `theme` and `font`; comma-separated combinations are allowed. `icon` is intentionally not supported, because icon changes may require full component reinstall and transforms.
- **Merge**: `npx shadcn@latest init --preset <code> --force --no-reinstall`, then run `npx shadcn@latest info` to list installed components, then for each installed component use `--dry-run` and `--diff` to [smart merge](#updating-components) it individually.
- **Skip**: `npx shadcn@latest init --preset <code> --force --no-reinstall`. Only updates config and CSS, leaves components as-is.
- **Important**: Always run preset commands inside the user's project directory. `apply` only works in an existing project with a `components.json` file. The CLI automatically preserves the current base (`base` vs `radix`) from `components.json`. If you must use a scratch/temp directory (e.g. for `--dry-run` comparisons), pass `--base <current-base>` explicitly — preset codes do not encode the base.
## Updating Components
When the user asks to update a component from upstream while keeping their local changes, use `--dry-run` and `--diff` to intelligently merge. **NEVER fetch raw files from GitHub manually — always use the CLI.**
1. Run `npx shadcn@latest add <component> --dry-run` to see all files that would be affected.
2. For each file, run `npx shadcn@latest add <component> --diff <file>` to see what changed upstream vs local.
3. Decide per file based on the diff:
- No local changes → safe to overwrite.
- Has local changes → read the local file, analyze the diff, and apply upstream updates while preserving local modifications.
- User says "just update everything" → use `--overwrite`, but confirm first.
4. **Never use `--overwrite` without the user's explicit approval.**
## Quick Reference
```bash
# Create a new project.
npx shadcn@latest init --name my-app --preset base-nova
npx shadcn@latest init --name my-app --preset a2r6bw --template vite
# Create a monorepo project.
npx shadcn@latest init --name my-app --preset base-nova --monorepo
npx shadcn@latest init --name my-app --preset base-nova --template next --monorepo
# Initialize existing project.
npx shadcn@latest init --preset base-nova
npx shadcn@latest init --defaults # shortcut: --template=next --preset=nova (base style implied)
# Apply a preset to an existing project.
npx shadcn@latest apply a2r6bw
npx shadcn@latest apply a2r6bw --only theme
npx shadcn@latest apply a2r6bw --only font
npx shadcn@latest apply a2r6bw --only theme,font
# Inspect preset codes and project preset state.
npx shadcn@latest preset decode a2r6bw
npx shadcn@latest preset url a2r6bw
npx shadcn@latest preset open a2r6bw
npx shadcn@latest preset resolve
npx shadcn@latest preset resolve --json
# Add components.
npx shadcn@latest add button card dialog
npx shadcn@latest add @magicui/shimmer-button
npx shadcn@latest add owner/repo/item
npx shadcn@latest add --all
# Preview changes before adding/updating.
npx shadcn@latest add button --dry-run
npx shadcn@latest add button --diff button.tsx
npx shadcn@latest add @acme/form --view button.tsx
npx shadcn@latest add owner/repo/item --dry-run
# Search registries.
npx shadcn@latest search @shadcn -q "sidebar"
npx shadcn@latest search @tailark -q "stats"
npx shadcn@latest search owner/repo -q "login"
npx shadcn@latest search # all configured registries
npx shadcn@latest search @shadcn -q "menu" -t ui # filter by item type
# Get component docs and example URLs.
npx shadcn@latest docs button dialog select
# View registry item details (for items not yet installed).
npx shadcn@latest view @shadcn/button
npx shadcn@latest view owner/repo/item
```
**Named presets:** `nova`, `vega`, `maia`, `lyra`, `mira`, `luma`
**Templates:** `next`, `vite`, `start`, `react-router`, `astro` (all support `--monorepo`) and `laravel` (not supported for monorepo)
**Preset codes:** Version-prefixed base62 strings (e.g. `a2r6bw` or `b0`), from [ui.shadcn.com](https://ui.shadcn.com).
## Detailed References
- [rules/forms.md](./rules/forms.md) — FieldGroup, Field, InputGroup, ToggleGroup, FieldSet, validation states
- [rules/composition.md](./rules/composition.md) — Groups, overlays, Card, Tabs, Avatar, Alert, Empty, Toast, Separator, Skeleton, Badge, Button loading
- [rules/icons.md](./rules/icons.md) — data-icon, icon sizing, passing icons as objects
- [rules/styling.md](./rules/styling.md) — Semantic colors, variants, className, spacing, size, truncate, dark mode, cn(), z-index
- [rules/base-vs-radix.md](./rules/base-vs-radix.md) — asChild vs render, Select, ToggleGroup, Slider, Accordion
- [cli.md](./cli.md) — Commands, flags, presets, templates
- [registry.md](./registry.md) — Authoring source registries, `include`, item definitions, dependencies, GitHub registry rules
- [customization.md](./customization.md) — Theming, CSS variables, extending components
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interface:
display_name: "shadcn/ui"
short_description: "Manages shadcn/ui components — adding, searching, fixing, debugging, styling, and composing UI."
icon_small: "./assets/shadcn-small.png"
icon_large: "./assets/shadcn.png"
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# shadcn CLI Reference
Configuration is read from `components.json`.
> **IMPORTANT:** Always run commands using the project's package runner: `npx shadcn@latest`, `pnpm dlx shadcn@latest`, or `bunx --bun shadcn@latest`. Check `packageManager` from project context to choose the right one. Examples below use `npx shadcn@latest` but substitute the correct runner for the project.
> **IMPORTANT:** Only use the flags documented below. Do not invent or guess flags — if a flag isn't listed here, it doesn't exist. The CLI auto-detects the package manager from the project's lockfile; there is no `--package-manager` flag.
## Contents
- Commands: init, apply, add (dry-run, smart merge), search, view, docs, info, build
- Templates: next, vite, start, react-router, astro
- Presets: named, code, URL formats and fields
- Switching presets
---
## Commands
### `init` — Initialize or create a project
```bash
npx shadcn@latest init [components...] [options]
```
Initializes shadcn/ui in an existing project or creates a new project (when `--name` is provided). Optionally installs components in the same step.
| Flag | Short | Description | Default |
| ----------------------- | ----- | --------------------------------------------------------- | ------- |
| `--template <template>` | `-t` | Template (next, start, vite, next-monorepo, react-router) | — |
| `--preset [name]` | `-p` | Preset configuration (named, code, or URL) | — |
| `--yes` | `-y` | Skip confirmation prompt | `true` |
| `--defaults` | `-d` | Use defaults (`--template=next --preset=base-nova`) | `false` |
| `--force` | `-f` | Force overwrite existing configuration | `false` |
| `--cwd <cwd>` | `-c` | Working directory | current |
| `--name <name>` | `-n` | Name for new project | — |
| `--silent` | `-s` | Mute output | `false` |
| `--rtl` | | Enable RTL support | — |
| `--reinstall` | | Re-install existing UI components | `false` |
| `--monorepo` | | Scaffold a monorepo project | — |
| `--no-monorepo` | | Skip the monorepo prompt | — |
`npx shadcn@latest create` is an alias for `npx shadcn@latest init`.
### `apply` — Apply a preset to an existing project
```bash
npx shadcn@latest apply [preset] [options]
```
Applies a preset to an existing project, overwriting preset-driven config, fonts, CSS variables, and detected UI components.
| Flag | Short | Description | Default |
| ------------------- | ----- | ------------------------------------------ | ------- |
| `--preset <preset>` | — | Preset configuration (named, code, or URL) | — |
| `--yes` | `-y` | Skip confirmation prompt | `false` |
| `--cwd <cwd>` | `-c` | Working directory | current |
| `--silent` | `-s` | Mute output | `false` |
`[preset]` is a shorthand for `--preset <preset>`. If both are provided, they must match.
If no preset is provided, the CLI offers to open the custom preset builder on `ui.shadcn.com/create`.
### `add` — Add components
> **IMPORTANT:** To compare local components against upstream or to preview changes, ALWAYS use `npx shadcn@latest add <component> --dry-run`, `--diff`, or `--view`. NEVER fetch raw files from GitHub or other sources manually. The CLI handles registry resolution, file paths, and CSS diffing automatically.
```bash
npx shadcn@latest add [components...] [options]
```
Accepts component names, registry-prefixed names (`@magicui/shimmer-button`),
GitHub item addresses (`owner/repo/item`), URLs, or local paths.
| Flag | Short | Description | Default |
| --------------- | ----- | -------------------------------------------------------------------------------------------------------------------- | ------- |
| `--yes` | `-y` | Skip confirmation prompt | `false` |
| `--overwrite` | `-o` | Overwrite existing files | `false` |
| `--cwd <cwd>` | `-c` | Working directory | current |
| `--all` | `-a` | Add all available components | `false` |
| `--path <path>` | `-p` | Target path for the component | — |
| `--silent` | `-s` | Mute output | `false` |
| `--dry-run` | | Preview all changes without writing files | `false` |
| `--diff [path]` | | Show diffs. Without a path, shows the first 5 files. With a path, shows that file only (implies `--dry-run`) | — |
| `--view [path]` | | Show file contents. Without a path, shows the first 5 files. With a path, shows that file only (implies `--dry-run`) | — |
#### Dry-Run Mode
Use `--dry-run` to preview what `add` would do without writing any files. `--diff` and `--view` both imply `--dry-run`.
```bash
# Preview all changes.
npx shadcn@latest add button --dry-run
# Show diffs for all files (top 5).
npx shadcn@latest add button --diff
# Show the diff for a specific file.
npx shadcn@latest add button --diff button.tsx
# Show contents for all files (top 5).
npx shadcn@latest add button --view
# Show the full content of a specific file.
npx shadcn@latest add button --view button.tsx
# Works with URLs too.
npx shadcn@latest add https://api.npoint.io/abc123 --dry-run
# Works with public GitHub registries too.
npx shadcn@latest add owner/repo/item --dry-run
# CSS diffs.
npx shadcn@latest add button --diff globals.css
```
**When to use dry-run:**
- When the user asks "what files will this add?" or "what will this change?" — use `--dry-run`.
- Before overwriting existing components — use `--diff` to preview the changes first.
- When the user wants to inspect component source code without installing — use `--view`.
- When checking what CSS changes would be made to `globals.css` — use `--diff globals.css`.
- When the user asks to review or audit third-party registry code before installing — use `--view` to inspect the source.
> **`npx shadcn@latest add --dry-run` vs `npx shadcn@latest view`:** Prefer `npx shadcn@latest add --dry-run/--diff/--view` over `npx shadcn@latest view` when the user wants to preview changes to their project. `npx shadcn@latest view` only shows raw registry metadata. `npx shadcn@latest add --dry-run` shows exactly what would happen in the user's project: resolved file paths, diffs against existing files, and CSS updates. Use `npx shadcn@latest view` only when the user wants to browse registry info without a project context.
#### Smart Merge from Upstream
See [Updating Components in SKILL.md](./SKILL.md#updating-components) for the full workflow.
### `search` — Search registries
```bash
npx shadcn@latest search [registries...] [options]
```
Fuzzy search across registries. Also aliased as `npx shadcn@latest list`.
Supports namespaces (`@acme`), public GitHub registry sources (`owner/repo`),
and registry catalog URLs. Without `-q`, lists all items. When no registries are
passed, searches every registry configured in `components.json`.
| Flag | Short | Description | Default |
| ------------------- | ----- | ------------------------------------------------- | ------- |
| `--query <query>` | `-q` | Search query | — |
| `--type <type>` | `-t` | Filter by item type (e.g. `ui`, `block`, `hook`); comma-separated | — |
| `--limit <number>` | `-l` | Max items to display | `100` |
| `--offset <number>` | `-o` | Items to skip | `0` |
| `--json` | | Output as JSON | `false` |
| `--cwd <cwd>` | `-c` | Working directory | current |
### `view` — View item details
```bash
npx shadcn@latest view <items...> [options]
```
Displays item info including file contents. Examples:
`npx shadcn@latest view @shadcn/button`,
`npx shadcn@latest view owner/repo/item`.
### `docs` — Get component documentation URLs
```bash
npx shadcn@latest docs <components...> [options]
```
Outputs resolved URLs for component documentation, examples, and API references. Accepts one or more component names. Fetch the URLs to get the actual content.
Example output for `npx shadcn@latest docs input button`:
```
base radix
input
docs https://ui.shadcn.com/docs/components/radix/input
examples https://raw.githubusercontent.com/.../examples/input-example.tsx
button
docs https://ui.shadcn.com/docs/components/radix/button
examples https://raw.githubusercontent.com/.../examples/button-example.tsx
```
Some components include an `api` link to the underlying library (e.g. `cmdk` for the command component).
### `diff` — Check for updates
Do not use this command. Use `npx shadcn@latest add --diff` instead.
### `info` — Project information
```bash
npx shadcn@latest info [options]
```
Displays project info and `components.json` configuration. Run this first to discover the project's framework, aliases, Tailwind version, and resolved paths.
| Flag | Short | Description | Default |
| ------------- | ----- | ----------------- | ------- |
| `--cwd <cwd>` | `-c` | Working directory | current |
**Project Info fields:**
| Field | Type | Meaning |
| -------------------- | --------- | ------------------------------------------------------------------ |
| `framework` | `string` | Detected framework (`next`, `vite`, `react-router`, `start`, etc.) |
| `frameworkVersion` | `string` | Framework version (e.g. `15.2.4`) |
| `isSrcDir` | `boolean` | Whether the project uses a `src/` directory |
| `isRSC` | `boolean` | Whether React Server Components are enabled |
| `isTsx` | `boolean` | Whether the project uses TypeScript |
| `tailwindVersion` | `string` | `"v3"` or `"v4"` |
| `tailwindConfigFile` | `string` | Path to the Tailwind config file |
| `tailwindCssFile` | `string` | Path to the global CSS file |
| `aliasPrefix` | `string` | Import alias prefix (e.g. `@`, `~`, `@/`) |
| `packageManager` | `string` | Detected package manager (`npm`, `pnpm`, `yarn`, `bun`) |
**Components.json fields:**
| Field | Type | Meaning |
| -------------------- | --------- | ------------------------------------------------------------------------------------------ |
| `base` | `string` | Primitive library (`radix` or `base`) — determines component APIs and available props |
| `style` | `string` | Visual style (e.g. `nova`, `vega`) |
| `rsc` | `boolean` | RSC flag from config |
| `tsx` | `boolean` | TypeScript flag |
| `tailwind.config` | `string` | Tailwind config path |
| `tailwind.css` | `string` | Global CSS path — this is where custom CSS variables go |
| `iconLibrary` | `string` | Icon library — determines icon import package (e.g. `lucide-react`, `@tabler/icons-react`) |
| `aliases.components` | `string` | Component import alias (e.g. `@/components`) |
| `aliases.utils` | `string` | Utils import alias (e.g. `@/lib/utils`) |
| `aliases.ui` | `string` | UI component alias (e.g. `@/components/ui`) |
| `aliases.lib` | `string` | Lib alias (e.g. `@/lib`) |
| `aliases.hooks` | `string` | Hooks alias (e.g. `@/hooks`) |
| `resolvedPaths` | `object` | Absolute file-system paths for each alias |
| `registries` | `object` | Configured custom registries |
**Links fields:**
The `info` output includes a **Links** section with templated URLs for component docs, source, and examples. For resolved URLs, use `npx shadcn@latest docs <component>` instead.
### `build` — Build a custom registry
```bash
npx shadcn@latest build [registry] [options]
```
Builds `registry.json` into individual JSON files for distribution. Default input: `./registry.json`, default output: `./public/r`.
For authoring rules, `include`, item definitions, `registryDependencies`, and
GitHub registry behavior, see [registry.md](./registry.md).
| Flag | Short | Description | Default |
| ----------------- | ----- | ----------------- | ------------ |
| `--output <path>` | `-o` | Output directory | `./public/r` |
| `--cwd <cwd>` | `-c` | Working directory | current |
---
## Templates
| Value | Framework | Monorepo support |
| -------------- | -------------- | ---------------- |
| `next` | Next.js | Yes |
| `vite` | Vite | Yes |
| `start` | TanStack Start | Yes |
| `react-router` | React Router | Yes |
| `astro` | Astro | Yes |
| `laravel` | Laravel | No |
All templates support monorepo scaffolding via the `--monorepo` flag. When passed, the CLI uses a monorepo-specific template directory (e.g. `next-monorepo`, `vite-monorepo`). When neither `--monorepo` nor `--no-monorepo` is passed, the CLI prompts interactively. Laravel does not support monorepo scaffolding.
---
## Presets
Three ways to specify a preset via `--preset`:
1. **Named:** `--preset nova` or `--preset lyra`
2. **Code:** `--preset a2r6bw` (version-prefixed base62 string, e.g. `a2r6bw` or `b0`)
3. **URL:** `--preset "https://ui.shadcn.com/init?base=radix&style=nova&..."`
> **IMPORTANT:** Never try to decode, fetch, or resolve preset codes manually. Preset codes are opaque — pass them directly to `npx shadcn@latest init --preset <code>` and let the CLI handle resolution.
> Use `npx shadcn@latest apply --preset <code>` when overwriting an existing project's preset.
## Switching Presets
Ask the user first: **overwrite**, **merge**, or **skip** existing components?
- **Overwrite / Re-install** → `npx shadcn@latest apply --preset <code>`. Overwrites all detected component files with the new preset styles. Use when the user hasn't customized components.
- **Merge** → `npx shadcn@latest init --preset <code> --force --no-reinstall`, then run `npx shadcn@latest info` to get the list of installed components and use the [smart merge workflow](./SKILL.md#updating-components) to update them one by one, preserving local changes. Use when the user has customized components.
- **Skip** → `npx shadcn@latest init --preset <code> --force --no-reinstall`. Only updates config and CSS variables, leaves existing components as-is.
Always run preset commands inside the user's project directory. `apply` only works in an existing project with a `components.json` file. The CLI automatically preserves the current base (`base` vs `radix`) from `components.json`. If you must use a scratch/temp directory (e.g. for `--dry-run` comparisons), pass `--base <current-base>` explicitly — preset codes do not encode the base.
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# Customization & Theming
Components reference semantic CSS variable tokens. Change the variables to change every component.
## Contents
- How it works (CSS variables → Tailwind utilities → components)
- Color variables and OKLCH format
- Dark mode setup
- Changing the theme (presets, CSS variables)
- Adding custom colors (Tailwind v3 and v4)
- Border radius
- Customizing components (variants, className, wrappers)
- Checking for updates
---
## How It Works
1. CSS variables defined in `:root` (light) and `.dark` (dark mode).
2. Tailwind maps them to utilities: `bg-primary`, `text-muted-foreground`, etc.
3. Components use these utilities — changing a variable changes all components that reference it.
---
## Color Variables
Every color follows the `name` / `name-foreground` convention. The base variable is for backgrounds, `-foreground` is for text/icons on that background.
| Variable | Purpose |
| -------------------------------------------- | -------------------------------- |
| `--background` / `--foreground` | Page background and default text |
| `--card` / `--card-foreground` | Card surfaces |
| `--primary` / `--primary-foreground` | Primary buttons and actions |
| `--secondary` / `--secondary-foreground` | Secondary actions |
| `--muted` / `--muted-foreground` | Muted/disabled states |
| `--accent` / `--accent-foreground` | Hover and accent states |
| `--destructive` / `--destructive-foreground` | Error and destructive actions |
| `--border` | Default border color |
| `--input` | Form input borders |
| `--ring` | Focus ring color |
| `--chart-1` through `--chart-5` | Chart/data visualization |
| `--sidebar-*` | Sidebar-specific colors |
| `--surface` / `--surface-foreground` | Secondary surface |
Colors use OKLCH: `--primary: oklch(0.205 0 0)` where values are lightness (01), chroma (0 = gray), and hue (0360).
---
## Dark Mode
Class-based toggle via `.dark` on the root element. In Next.js, use `next-themes`:
```tsx
import { ThemeProvider } from "next-themes"
<ThemeProvider attribute="class" defaultTheme="system" enableSystem>
{children}
</ThemeProvider>
```
---
## Changing the Theme
```bash
# Apply a preset code from ui.shadcn.com.
npx shadcn@latest apply --preset a2r6bw
# Positional shorthand also works.
npx shadcn@latest apply a2r6bw
# Switch to a named preset and overwrite existing components.
npx shadcn@latest apply --preset nova
# Preserve existing components instead.
npx shadcn@latest init --preset nova --force --no-reinstall
# Use a custom theme URL.
npx shadcn@latest apply --preset "https://ui.shadcn.com/init?base=radix&style=nova&theme=blue&..."
```
Or edit CSS variables directly in `globals.css`.
---
## Adding Custom Colors
Add variables to the file at `tailwindCssFile` from `npx shadcn@latest info` (typically `globals.css`). Never create a new CSS file for this.
```css
/* 1. Define in the global CSS file. */
:root {
--warning: oklch(0.84 0.16 84);
--warning-foreground: oklch(0.28 0.07 46);
}
.dark {
--warning: oklch(0.41 0.11 46);
--warning-foreground: oklch(0.99 0.02 95);
}
```
```css
/* 2a. Register with Tailwind v4 (@theme inline). */
@theme inline {
--color-warning: var(--warning);
--color-warning-foreground: var(--warning-foreground);
}
```
When `tailwindVersion` is `"v3"` (check via `npx shadcn@latest info`), register in `tailwind.config.js` instead:
```js
// 2b. Register with Tailwind v3 (tailwind.config.js).
module.exports = {
theme: {
extend: {
colors: {
warning: "oklch(var(--warning) / <alpha-value>)",
"warning-foreground":
"oklch(var(--warning-foreground) / <alpha-value>)",
},
},
},
}
```
```tsx
// 3. Use in components.
<div className="bg-warning text-warning-foreground">Warning</div>
```
---
## Border Radius
`--radius` controls border radius globally. Components derive values from it (`rounded-lg` = `var(--radius)`, `rounded-md` = `calc(var(--radius) - 2px)`).
---
## Customizing Components
See also: [rules/styling.md](./rules/styling.md) for Incorrect/Correct examples.
Prefer these approaches in order:
### 1. Built-in variants
```tsx
<Button variant="outline" size="sm">
Click
</Button>
```
### 2. Tailwind classes via `className`
```tsx
<Card className="mx-auto max-w-md">...</Card>
```
### 3. Add a new variant
Edit the component source to add a variant via `cva`:
```tsx
// components/ui/button.tsx
warning: "bg-warning text-warning-foreground hover:bg-warning/90",
```
### 4. Wrapper components
Compose shadcn/ui primitives into higher-level components:
```tsx
export function ConfirmDialog({ title, description, onConfirm, children }) {
return (
<AlertDialog>
<AlertDialogTrigger asChild>{children}</AlertDialogTrigger>
<AlertDialogContent>
<AlertDialogHeader>
<AlertDialogTitle>{title}</AlertDialogTitle>
<AlertDialogDescription>{description}</AlertDialogDescription>
</AlertDialogHeader>
<AlertDialogFooter>
<AlertDialogCancel>Cancel</AlertDialogCancel>
<AlertDialogAction onClick={onConfirm}>Confirm</AlertDialogAction>
</AlertDialogFooter>
</AlertDialogContent>
</AlertDialog>
)
}
```
---
## Checking for Updates
```bash
npx shadcn@latest add button --diff
```
To preview exactly what would change before updating, use `--dry-run` and `--diff`:
```bash
npx shadcn@latest add button --dry-run # see all affected files
npx shadcn@latest add button --diff button.tsx # see the diff for a specific file
```
See [Updating Components in SKILL.md](./SKILL.md#updating-components) for the full smart merge workflow.
+47
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@@ -0,0 +1,47 @@
{
"skill_name": "shadcn",
"evals": [
{
"id": 1,
"prompt": "I'm building a Next.js app with shadcn/ui (base-nova preset, lucide icons). Create a settings form component with fields for: full name, email address, and notification preferences (email, SMS, push notifications as toggle options). Add validation states for required fields.",
"expected_output": "A React component using FieldGroup, Field, ToggleGroup, data-invalid/aria-invalid validation, gap-* spacing, and semantic colors.",
"files": [],
"expectations": [
"Uses FieldGroup and Field components for form layout instead of raw div with space-y",
"Uses Switch for independent on/off notification toggles (not looping Button with manual active state)",
"Uses data-invalid on Field and aria-invalid on the input control for validation states",
"Uses gap-* (e.g. gap-4, gap-6) instead of space-y-* or space-x-* for spacing",
"Uses semantic color tokens (e.g. bg-background, text-muted-foreground, text-destructive) instead of raw colors like bg-red-500",
"No manual dark: color overrides"
]
},
{
"id": 2,
"prompt": "Create a dialog component for editing a user profile. It should have the user's avatar at the top, input fields for name and bio, and Save/Cancel buttons with appropriate icons. Using shadcn/ui with radix-nova preset and tabler icons.",
"expected_output": "A React component with DialogTitle, Avatar+AvatarFallback, data-icon on icon buttons, no icon sizing classes, tabler icon imports.",
"files": [],
"expectations": [
"Includes DialogTitle for accessibility (visible or with sr-only class)",
"Avatar component includes AvatarFallback",
"Icons on buttons use the data-icon attribute (data-icon=\"inline-start\" or data-icon=\"inline-end\")",
"No sizing classes on icons inside components (no size-4, w-4, h-4, etc.)",
"Uses tabler icons (@tabler/icons-react) instead of lucide-react",
"Uses asChild for custom triggers (radix preset)"
]
},
{
"id": 3,
"prompt": "Create a dashboard component that shows 4 stat cards in a grid. Each card has a title, large number, percentage change badge, and a loading skeleton state. Using shadcn/ui with base-nova preset and lucide icons.",
"expected_output": "A React component with full Card composition, Skeleton for loading, Badge for changes, semantic colors, gap-* spacing.",
"files": [],
"expectations": [
"Uses full Card composition with CardHeader, CardTitle, CardContent (not dumping everything into CardContent)",
"Uses Skeleton component for loading placeholders instead of custom animate-pulse divs",
"Uses Badge component for percentage change instead of custom styled spans",
"Uses semantic color tokens instead of raw color values like bg-green-500 or text-red-600",
"Uses gap-* instead of space-y-* or space-x-* for spacing",
"Uses size-* when width and height are equal instead of separate w-* h-*"
]
}
]
}
+105
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# shadcn MCP Server
The CLI includes an MCP server that lets AI assistants search, browse, view, and install items from registries.
---
## Setup
```bash
shadcn mcp # start the MCP server (stdio)
shadcn mcp init # write config for your editor
```
Editor config files:
| Editor | Config file |
| ----------- | ------------------------------- |
| Claude Code | `.mcp.json` |
| Cursor | `.cursor/mcp.json` |
| VS Code | `.vscode/mcp.json` |
| OpenCode | `opencode.json` |
| Codex | `~/.codex/config.toml` (manual) |
---
## Tools
> **Tip:** MCP tools handle registry operations (search, view, install). For project configuration (aliases, framework, Tailwind version), use `npx shadcn@latest info` — there is no MCP equivalent.
### `shadcn:get_project_registries`
Returns registry names from `components.json`. Errors if no `components.json` exists.
**Input:** none
### `shadcn:list_items_in_registries`
Lists all items from one or more registries. Registries can be configured
namespaces such as `@acme`, public GitHub sources such as `owner/repo`, or
registry catalog URLs. Omit `registries` to list from every registry configured
in `components.json`.
**Input:** `registries` (string[], optional — omit for all configured), `types` (string[], optional — e.g. `["ui", "block"]`), `limit` (number, optional, defaults to 100), `offset` (number, optional)
### `shadcn:search_items_in_registries`
Fuzzy search across registries. Registries can be configured namespaces, public
GitHub sources, or registry catalog URLs. Omit `registries` to search every
registry configured in `components.json` — e.g. "find me a hero" across all
configured registries.
**Input:** `registries` (string[], optional — omit for all configured), `query` (string), `types` (string[], optional — e.g. `["ui", "block"]`), `limit` (number, optional, defaults to 100), `offset` (number, optional)
### `shadcn:view_items_in_registries`
View item details including full file contents.
**Input:** `items` (string[]) — e.g.
`["@shadcn/button", "@shadcn/card", "owner/repo/item"]`
### `shadcn:get_item_examples_from_registries`
Find usage examples and demos with source code. Omit `registries` to search
every registry configured in `components.json`.
**Input:** `registries` (string[], optional — omit for all configured), `query` (string) — e.g. `"accordion-demo"`, `"button example"`
### `shadcn:get_add_command_for_items`
Returns the CLI install command.
**Input:** `items` (string[]) — e.g. `["@shadcn/button"]`
### `shadcn:get_audit_checklist`
Returns a checklist for verifying components (imports, deps, lint, TypeScript).
**Input:** none
---
## Configuring Registries
Namespaced and authenticated registries are set in `components.json`. The
`@shadcn` registry is always built-in. Public GitHub registries can also be used
directly as `owner/repo` registry sources when the repository has a root
`registry.json`; they do not need `components.json` configuration.
```json
{
"registries": {
"@acme": "https://acme.com/r/{name}.json",
"@private": {
"url": "https://private.com/r/{name}.json",
"headers": { "Authorization": "Bearer ${MY_TOKEN}" }
}
}
}
```
- Names must start with `@`.
- URLs must contain `{name}`.
- `${VAR}` references are resolved from environment variables.
Community registry index: `https://ui.shadcn.com/r/registries.json`
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# Registry Authoring and Addresses
Use this reference when the user wants to create, fix, publish, or reason about
a shadcn registry.
## Mental Model
A registry has two forms:
- **Source registry**: an authored `registry.json` in a project or repository.
It may use `include` and file paths that point at source files.
- **Built registry**: generated JSON files served to CLI consumers, usually
from `public/r`. Use `npx shadcn@latest build` to create this form.
The CLI installer consumes registry item payloads. A source registry is a way to
author those payloads from real files.
Registry items are not limited to React components. They can distribute
components, hooks, utilities, design tokens, pages, config files, docs, rules,
workflows, templates, MCP files, and other project files.
## Root `registry.json`
The root registry file should define registry metadata and either `items` or
`include`.
```json
{
"$schema": "https://ui.shadcn.com/schema/registry.json",
"name": "acme",
"homepage": "https://acme.com",
"items": [
{
"name": "absolute-url",
"type": "registry:lib",
"title": "Absolute URL",
"description": "A utility to turn any path into an absolute URL.",
"files": [
{
"path": "lib/absolute-url.ts",
"type": "registry:lib"
}
]
}
]
}
```
Root registry rules:
- Root `registry.json` must include `name` and `homepage`.
- `items` is an array of registry item definitions.
- `include` may be used to split the source registry into multiple files.
- Included registry files may omit `name` and `homepage`.
## Include
Use `include` to keep large registries modular.
```json
{
"$schema": "https://ui.shadcn.com/schema/registry.json",
"name": "acme",
"homepage": "https://acme.com",
"include": ["registry/ui/registry.json", "registry/blocks/registry.json"]
}
```
Include rules:
- Include paths are relative to the `registry.json` that declares them.
- Include paths must explicitly point to a `registry.json` file.
- Do not use remote URLs, absolute paths, or parent traversal (`..`).
- Item file paths are relative to the registry file that declares the item.
- Duplicate item names fail across the resolved registry.
Example included file:
```json
{
"items": [
{
"name": "button",
"type": "registry:ui",
"files": [
{
"path": "button.tsx",
"type": "registry:ui"
}
]
}
]
}
```
If this file is at `registry/ui/registry.json`, then `button.tsx` is read from
`registry/ui/button.tsx`, and the built item path is emitted relative to the
root registry.
## Item Definitions
Common item fields:
```json
{
"name": "login-form",
"type": "registry:block",
"title": "Login Form",
"description": "A login form with email and password fields.",
"dependencies": ["zod"],
"registryDependencies": ["button", "input", "label"],
"files": [
{
"path": "blocks/login-form.tsx",
"type": "registry:block"
}
],
"cssVars": {
"light": {
"brand": "oklch(0.62 0.18 250)"
},
"dark": {
"brand": "oklch(0.72 0.16 250)"
}
}
}
```
Important fields:
- `name`: the installable item name. It is not necessarily a file path.
- `type`: one of the registry item types, such as `registry:ui`,
`registry:block`, `registry:lib`, `registry:hook`, `registry:file`,
`registry:page`, `registry:theme`, `registry:style`, `registry:font`, or
`registry:item`.
- `files`: source files copied or generated by the item.
- `dependencies`: npm runtime dependencies.
- `devDependencies`: npm development dependencies.
- `registryDependencies`: other registry items required by this item.
- `cssVars`, `css`, `tailwind`, `envVars`, and `docs`: optional install-time
additions.
File rules:
- File paths are relative to the declaring `registry.json`.
- `registry:file` and `registry:page` files require a `target`.
- Do not use remote file URLs in source registry file paths.
- Keep source files copy-pasteable: no hidden app-only imports.
## Registry Dependencies
`registryDependencies` entries are item addresses, not file paths.
```json
{
"name": "login-form",
"type": "registry:block",
"registryDependencies": ["button", "@acme/input", "acme/ui/card#v1.2.0"],
"files": [
{
"path": "blocks/login-form.tsx",
"type": "registry:block"
}
]
}
```
Dependency rules:
- Bare names such as `"button"` mean official shadcn items.
- Bare names never mean same-registry or same-repository items.
- Namespaced dependencies use `@namespace/item-name`.
- GitHub dependencies use `owner/repo/item-name`.
- Pin GitHub dependencies with `owner/repo/item-name#ref` when needed.
- Refs are not inherited. If `owner/repo/foo#v2` depends on `bar` from the same
repo at `v2`, write `owner/repo/bar#v2`.
- Do not use relative dependencies such as `"./bar"`.
## Address Schemes
When reasoning about a registry item string, classify it first.
| Address | Scheme | Meaning |
| ----------------------------------- | --------- | ------------------------------------------------------------ |
| `button` | shadcn | Official shadcn item named `button`. |
| `@acme/button` | namespace | Item `button` from configured registry `@acme`. |
| `@acme/ui/button` | namespace | Item `ui/button` from configured registry `@acme`. |
| `https://example.com/r/button.json` | url | Built registry item JSON at that URL. |
| `./button.json` | file | Built registry item JSON on disk. |
| `acme/ui/button` | github | Item `button` from GitHub repo `acme/ui`. |
| `acme/ui/forms/login#main` | github | Item `forms/login` from GitHub repo `acme/ui` at ref `main`. |
For namespace and GitHub addresses, slashful item names are allowed and are item
names, not file paths. Addresses ending in `.json` keep file-address
precedence, so `acme/ui/data/schema.json` is treated as a file path, not a
GitHub item address.
## GitHub Registries
A public GitHub repository can act as a source registry when it has a root
`registry.json`.
```txt
owner/repo/item-name[#ref]
```
Rules:
- The first two path segments are GitHub owner and repo.
- All remaining path segments are the registry item name.
- The source entrypoint is always root `registry.json`.
- GitHub registries are source registries consumed directly by the CLI. They do
not require `shadcn build` or generated item JSON files.
- `include` follows the same source-registry rules as local registries.
- Currently, GitHub addresses support public `github.com` repositories only.
- Private repos and GitHub Enterprise require explicit product decisions.
When implementing GitHub registry fetching, resolve refs to a commit SHA before
reading source files. Do not read moving refs directly from
`raw.githubusercontent.com`, because branch-like refs can be cached for several
minutes.
Preferred flow:
```txt
owner/repo[#ref]
-> resolve ref with git ls-remote
-> commit SHA
-> read https://raw.githubusercontent.com/{owner}/{repo}/{sha}/registry.json
-> read includes and item files from the same SHA
```
This keeps a command on one consistent repository snapshot.
Full 40-character commit SHAs are already stable and can be used directly.
Branches, tags, and short refs require Git so the CLI can resolve them to a
commit SHA first.
## Build and Verify
Use the CLI to build source registries:
```bash
npx shadcn@latest build
npx shadcn@latest build registry.json --output public/r
```
Use CLI commands to inspect the result:
```bash
npx shadcn@latest list @acme
npx shadcn@latest search @acme -q "login"
npx shadcn@latest view @acme/login-form
npx shadcn@latest add @acme/login-form --dry-run
npx shadcn@latest registry validate ./registry.json
```
Use GitHub addresses directly for public GitHub registries:
```bash
npx shadcn@latest list owner/repo
npx shadcn@latest search owner/repo -q "login"
npx shadcn@latest view owner/repo/item
npx shadcn@latest add owner/repo/item --dry-run
npx shadcn@latest registry validate owner/repo
```
When working on registry implementation in the shadcn/ui codebase:
- Keep address parsing pure and testable.
- Do not add side effects to validators.
- Preserve existing behavior for official shadcn, namespace, URL, and file
schemes.
- Add tests for address parsing, source loading, dependency resolution, list,
search, view, and add paths.
- Prefer small source-reader abstractions over a plugin system until there are
multiple real providers.
@@ -0,0 +1,306 @@
# Base vs Radix
API differences between `base` and `radix`. Check the `base` field from `npx shadcn@latest info`.
## Contents
- Composition: asChild vs render
- Button / trigger as non-button element
- Select (items prop, placeholder, positioning, multiple, object values)
- ToggleGroup (type vs multiple)
- Slider (scalar vs array)
- Accordion (type and defaultValue)
---
## Composition: asChild (radix) vs render (base)
Radix uses `asChild` to replace the default element. Base uses `render`. Don't wrap triggers in extra elements.
**Incorrect:**
```tsx
<DialogTrigger>
<div>
<Button>Open</Button>
</div>
</DialogTrigger>
```
**Correct (radix):**
```tsx
<DialogTrigger asChild>
<Button>Open</Button>
</DialogTrigger>
```
**Correct (base):**
```tsx
<DialogTrigger render={<Button />}>Open</DialogTrigger>
```
This applies to all trigger and close components: `DialogTrigger`, `SheetTrigger`, `AlertDialogTrigger`, `DropdownMenuTrigger`, `PopoverTrigger`, `TooltipTrigger`, `CollapsibleTrigger`, `DialogClose`, `SheetClose`, `NavigationMenuLink`, `BreadcrumbLink`, `SidebarMenuButton`, `Badge`, `Item`.
---
## Button / trigger as non-button element (base only)
When `render` changes an element to a non-button (`<a>`, `<span>`), add `nativeButton={false}`.
**Incorrect (base):** missing `nativeButton={false}`.
```tsx
<Button render={<a href="/docs" />}>Read the docs</Button>
```
**Correct (base):**
```tsx
<Button render={<a href="/docs" />} nativeButton={false}>
Read the docs
</Button>
```
**Correct (radix):**
```tsx
<Button asChild>
<a href="/docs">Read the docs</a>
</Button>
```
Same for triggers whose `render` is not a `Button`:
```tsx
// base.
<PopoverTrigger render={<InputGroupAddon />} nativeButton={false}>
Pick date
</PopoverTrigger>
```
---
## Select
**items prop (base only).** Base requires an `items` prop on the root. Radix uses inline JSX only.
**Incorrect (base):**
```tsx
<Select>
<SelectTrigger><SelectValue placeholder="Select a fruit" /></SelectTrigger>
</Select>
```
**Correct (base):**
```tsx
const items = [
{ label: "Select a fruit", value: null },
{ label: "Apple", value: "apple" },
{ label: "Banana", value: "banana" },
]
<Select items={items}>
<SelectTrigger>
<SelectValue />
</SelectTrigger>
<SelectContent>
<SelectGroup>
{items.map((item) => (
<SelectItem key={item.value} value={item.value}>{item.label}</SelectItem>
))}
</SelectGroup>
</SelectContent>
</Select>
```
**Correct (radix):**
```tsx
<Select>
<SelectTrigger>
<SelectValue placeholder="Select a fruit" />
</SelectTrigger>
<SelectContent>
<SelectGroup>
<SelectItem value="apple">Apple</SelectItem>
<SelectItem value="banana">Banana</SelectItem>
</SelectGroup>
</SelectContent>
</Select>
```
**Placeholder.** Base uses a `{ value: null }` item in the items array. Radix uses `<SelectValue placeholder="...">`.
**Content positioning.** Base uses `alignItemWithTrigger`. Radix uses `position`.
```tsx
// base.
<SelectContent alignItemWithTrigger={false} side="bottom">
// radix.
<SelectContent position="popper">
```
---
## Select — multiple selection and object values (base only)
Base supports `multiple`, render-function children on `SelectValue`, and object values with `itemToStringValue`. Radix is single-select with string values only.
**Correct (base — multiple selection):**
```tsx
<Select items={items} multiple defaultValue={[]}>
<SelectTrigger>
<SelectValue>
{(value: string[]) => value.length === 0 ? "Select fruits" : `${value.length} selected`}
</SelectValue>
</SelectTrigger>
...
</Select>
```
**Correct (base — object values):**
```tsx
<Select defaultValue={plans[0]} itemToStringValue={(plan) => plan.name}>
<SelectTrigger>
<SelectValue>{(value) => value.name}</SelectValue>
</SelectTrigger>
...
</Select>
```
---
## ToggleGroup
Base uses a `multiple` boolean prop. Radix uses `type="single"` or `type="multiple"`.
**Incorrect (base):**
```tsx
<ToggleGroup type="single" defaultValue="daily">
<ToggleGroupItem value="daily">Daily</ToggleGroupItem>
</ToggleGroup>
```
**Correct (base):**
```tsx
// Single (no prop needed), defaultValue is always an array.
<ToggleGroup defaultValue={["daily"]} spacing={2}>
<ToggleGroupItem value="daily">Daily</ToggleGroupItem>
<ToggleGroupItem value="weekly">Weekly</ToggleGroupItem>
</ToggleGroup>
// Multi-selection.
<ToggleGroup multiple>
<ToggleGroupItem value="bold">Bold</ToggleGroupItem>
<ToggleGroupItem value="italic">Italic</ToggleGroupItem>
</ToggleGroup>
```
**Correct (radix):**
```tsx
// Single, defaultValue is a string.
<ToggleGroup type="single" defaultValue="daily" spacing={2}>
<ToggleGroupItem value="daily">Daily</ToggleGroupItem>
<ToggleGroupItem value="weekly">Weekly</ToggleGroupItem>
</ToggleGroup>
// Multi-selection.
<ToggleGroup type="multiple">
<ToggleGroupItem value="bold">Bold</ToggleGroupItem>
<ToggleGroupItem value="italic">Italic</ToggleGroupItem>
</ToggleGroup>
```
**Controlled single value:**
```tsx
// base — wrap/unwrap arrays.
const [value, setValue] = React.useState("normal")
<ToggleGroup value={[value]} onValueChange={(v) => setValue(v[0])}>
// radix — plain string.
const [value, setValue] = React.useState("normal")
<ToggleGroup type="single" value={value} onValueChange={setValue}>
```
---
## Slider
Base accepts a plain number for a single thumb. Radix always requires an array.
**Incorrect (base):**
```tsx
<Slider defaultValue={[50]} max={100} step={1} />
```
**Correct (base):**
```tsx
<Slider defaultValue={50} max={100} step={1} />
```
**Correct (radix):**
```tsx
<Slider defaultValue={[50]} max={100} step={1} />
```
Both use arrays for range sliders. Controlled `onValueChange` in base may need a cast:
```tsx
// base.
const [value, setValue] = React.useState([0.3, 0.7])
<Slider value={value} onValueChange={(v) => setValue(v as number[])} />
// radix.
const [value, setValue] = React.useState([0.3, 0.7])
<Slider value={value} onValueChange={setValue} />
```
---
## Accordion
Radix requires `type="single"` or `type="multiple"` and supports `collapsible`. `defaultValue` is a string. Base uses no `type` prop, uses `multiple` boolean, and `defaultValue` is always an array.
**Incorrect (base):**
```tsx
<Accordion type="single" collapsible defaultValue="item-1">
<AccordionItem value="item-1">...</AccordionItem>
</Accordion>
```
**Correct (base):**
```tsx
<Accordion defaultValue={["item-1"]}>
<AccordionItem value="item-1">...</AccordionItem>
</Accordion>
// Multi-select.
<Accordion multiple defaultValue={["item-1", "item-2"]}>
<AccordionItem value="item-1">...</AccordionItem>
<AccordionItem value="item-2">...</AccordionItem>
</Accordion>
```
**Correct (radix):**
```tsx
<Accordion type="single" collapsible defaultValue="item-1">
<AccordionItem value="item-1">...</AccordionItem>
</Accordion>
```
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# Component Composition
## Contents
- Items always inside their Group component
- Callouts use Alert
- Empty states use Empty component
- Toast notifications use sonner
- Choosing between overlay components
- Dialog, Sheet, and Drawer always need a Title
- Card structure
- Button has no isPending or isLoading prop
- TabsTrigger must be inside TabsList
- Avatar always needs AvatarFallback
- Use Separator instead of raw hr or border divs
- Use Skeleton for loading placeholders
- Use Badge instead of custom styled spans
---
## Items always inside their Group component
Never render items directly inside the content container.
**Incorrect:**
```tsx
<SelectContent>
<SelectItem value="apple">Apple</SelectItem>
<SelectItem value="banana">Banana</SelectItem>
</SelectContent>
```
**Correct:**
```tsx
<SelectContent>
<SelectGroup>
<SelectItem value="apple">Apple</SelectItem>
<SelectItem value="banana">Banana</SelectItem>
</SelectGroup>
</SelectContent>
```
This applies to all group-based components:
| Item | Group |
|------|-------|
| `SelectItem`, `SelectLabel` | `SelectGroup` |
| `DropdownMenuItem`, `DropdownMenuLabel`, `DropdownMenuSub` | `DropdownMenuGroup` |
| `MenubarItem` | `MenubarGroup` |
| `ContextMenuItem` | `ContextMenuGroup` |
| `CommandItem` | `CommandGroup` |
---
## Callouts use Alert
```tsx
<Alert>
<AlertTitle>Warning</AlertTitle>
<AlertDescription>Something needs attention.</AlertDescription>
</Alert>
```
---
## Empty states use Empty component
```tsx
<Empty>
<EmptyHeader>
<EmptyMedia variant="icon"><FolderIcon /></EmptyMedia>
<EmptyTitle>No projects yet</EmptyTitle>
<EmptyDescription>Get started by creating a new project.</EmptyDescription>
</EmptyHeader>
<EmptyContent>
<Button>Create Project</Button>
</EmptyContent>
</Empty>
```
---
## Toast notifications use sonner
```tsx
import { toast } from "sonner"
toast.success("Changes saved.")
toast.error("Something went wrong.")
toast("File deleted.", {
action: { label: "Undo", onClick: () => undoDelete() },
})
```
---
## Choosing between overlay components
| Use case | Component |
|----------|-----------|
| Focused task that requires input | `Dialog` |
| Destructive action confirmation | `AlertDialog` |
| Side panel with details or filters | `Sheet` |
| Mobile-first bottom panel | `Drawer` |
| Quick info on hover | `HoverCard` |
| Small contextual content on click | `Popover` |
---
## Dialog, Sheet, and Drawer always need a Title
`DialogTitle`, `SheetTitle`, `DrawerTitle` are required for accessibility. Use `className="sr-only"` if visually hidden.
```tsx
<DialogContent>
<DialogHeader>
<DialogTitle>Edit Profile</DialogTitle>
<DialogDescription>Update your profile.</DialogDescription>
</DialogHeader>
...
</DialogContent>
```
---
## Card structure
Use full composition — don't dump everything into `CardContent`:
```tsx
<Card>
<CardHeader>
<CardTitle>Team Members</CardTitle>
<CardDescription>Manage your team.</CardDescription>
</CardHeader>
<CardContent>...</CardContent>
<CardFooter>
<Button>Invite</Button>
</CardFooter>
</Card>
```
---
## Button has no isPending or isLoading prop
Compose with `Spinner` + `data-icon` + `disabled`:
```tsx
<Button disabled>
<Spinner data-icon="inline-start" />
Saving...
</Button>
```
---
## TabsTrigger must be inside TabsList
Never render `TabsTrigger` directly inside `Tabs` — always wrap in `TabsList`:
```tsx
<Tabs defaultValue="account">
<TabsList>
<TabsTrigger value="account">Account</TabsTrigger>
<TabsTrigger value="password">Password</TabsTrigger>
</TabsList>
<TabsContent value="account">...</TabsContent>
</Tabs>
```
---
## Avatar always needs AvatarFallback
Always include `AvatarFallback` for when the image fails to load:
```tsx
<Avatar>
<AvatarImage src="/avatar.png" alt="User" />
<AvatarFallback>JD</AvatarFallback>
</Avatar>
```
---
## Use existing components instead of custom markup
| Instead of | Use |
|---|---|
| `<hr>` or `<div className="border-t">` | `<Separator />` |
| `<div className="animate-pulse">` with styled divs | `<Skeleton className="h-4 w-3/4" />` |
| `<span className="rounded-full bg-green-100 ...">` | `<Badge variant="secondary">` |
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# Forms & Inputs
## Contents
- Forms use FieldGroup + Field
- InputGroup requires InputGroupInput/InputGroupTextarea
- Buttons inside inputs use InputGroup + InputGroupAddon
- Option sets (27 choices) use ToggleGroup
- FieldSet + FieldLegend for grouping related fields
- Field validation and disabled states
---
## Forms use FieldGroup + Field
Always use `FieldGroup` + `Field` — never raw `div` with `space-y-*`:
```tsx
<FieldGroup>
<Field>
<FieldLabel htmlFor="email">Email</FieldLabel>
<Input id="email" type="email" />
</Field>
<Field>
<FieldLabel htmlFor="password">Password</FieldLabel>
<Input id="password" type="password" />
</Field>
</FieldGroup>
```
Use `Field orientation="horizontal"` for settings pages. Use `FieldLabel className="sr-only"` for visually hidden labels.
**Choosing form controls:**
- Simple text input → `Input`
- Dropdown with predefined options → `Select`
- Searchable dropdown → `Combobox`
- Native HTML select (no JS) → `native-select`
- Boolean toggle → `Switch` (for settings) or `Checkbox` (for forms)
- Single choice from few options → `RadioGroup`
- Toggle between 25 options → `ToggleGroup` + `ToggleGroupItem`
- OTP/verification code → `InputOTP`
- Multi-line text → `Textarea`
---
## InputGroup requires InputGroupInput/InputGroupTextarea
Never use raw `Input` or `Textarea` inside an `InputGroup`.
**Incorrect:**
```tsx
<InputGroup>
<Input placeholder="Search..." />
</InputGroup>
```
**Correct:**
```tsx
import { InputGroup, InputGroupInput } from "@/components/ui/input-group"
<InputGroup>
<InputGroupInput placeholder="Search..." />
</InputGroup>
```
---
## Buttons inside inputs use InputGroup + InputGroupAddon
Never place a `Button` directly inside or adjacent to an `Input` with custom positioning.
**Incorrect:**
```tsx
<div className="relative">
<Input placeholder="Search..." className="pr-10" />
<Button className="absolute right-0 top-0" size="icon">
<SearchIcon />
</Button>
</div>
```
**Correct:**
```tsx
import { InputGroup, InputGroupInput, InputGroupAddon } from "@/components/ui/input-group"
<InputGroup>
<InputGroupInput placeholder="Search..." />
<InputGroupAddon>
<Button size="icon">
<SearchIcon data-icon="inline-start" />
</Button>
</InputGroupAddon>
</InputGroup>
```
---
## Option sets (27 choices) use ToggleGroup
Don't manually loop `Button` components with active state.
**Incorrect:**
```tsx
const [selected, setSelected] = useState("daily")
<div className="flex gap-2">
{["daily", "weekly", "monthly"].map((option) => (
<Button
key={option}
variant={selected === option ? "default" : "outline"}
onClick={() => setSelected(option)}
>
{option}
</Button>
))}
</div>
```
**Correct:**
```tsx
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group"
<ToggleGroup spacing={2}>
<ToggleGroupItem value="daily">Daily</ToggleGroupItem>
<ToggleGroupItem value="weekly">Weekly</ToggleGroupItem>
<ToggleGroupItem value="monthly">Monthly</ToggleGroupItem>
</ToggleGroup>
```
Combine with `Field` for labelled toggle groups:
```tsx
<Field orientation="horizontal">
<FieldTitle id="theme-label">Theme</FieldTitle>
<ToggleGroup aria-labelledby="theme-label" spacing={2}>
<ToggleGroupItem value="light">Light</ToggleGroupItem>
<ToggleGroupItem value="dark">Dark</ToggleGroupItem>
<ToggleGroupItem value="system">System</ToggleGroupItem>
</ToggleGroup>
</Field>
```
> **Note:** `defaultValue` and `type`/`multiple` props differ between base and radix. See [base-vs-radix.md](./base-vs-radix.md#togglegroup).
---
## FieldSet + FieldLegend for grouping related fields
Use `FieldSet` + `FieldLegend` for related checkboxes, radios, or switches — not `div` with a heading:
```tsx
<FieldSet>
<FieldLegend variant="label">Preferences</FieldLegend>
<FieldDescription>Select all that apply.</FieldDescription>
<FieldGroup className="gap-3">
<Field orientation="horizontal">
<Checkbox id="dark" />
<FieldLabel htmlFor="dark" className="font-normal">Dark mode</FieldLabel>
</Field>
</FieldGroup>
</FieldSet>
```
---
## Field validation and disabled states
Both attributes are needed — `data-invalid`/`data-disabled` styles the field (label, description), while `aria-invalid`/`disabled` styles the control.
```tsx
// Invalid.
<Field data-invalid>
<FieldLabel htmlFor="email">Email</FieldLabel>
<Input id="email" aria-invalid />
<FieldDescription>Invalid email address.</FieldDescription>
</Field>
// Disabled.
<Field data-disabled>
<FieldLabel htmlFor="email">Email</FieldLabel>
<Input id="email" disabled />
</Field>
```
Works for all controls: `Input`, `Textarea`, `Select`, `Checkbox`, `RadioGroupItem`, `Switch`, `Slider`, `NativeSelect`, `InputOTP`.
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# Icons
**Always use the project's configured `iconLibrary` for imports.** Check the `iconLibrary` field from project context: `lucide``lucide-react`, `tabler``@tabler/icons-react`, etc. Never assume `lucide-react`.
---
## Icons in Button use data-icon attribute
Add `data-icon="inline-start"` (prefix) or `data-icon="inline-end"` (suffix) to the icon. No sizing classes on the icon.
**Incorrect:**
```tsx
<Button>
<SearchIcon className="mr-2 size-4" />
Search
</Button>
```
**Correct:**
```tsx
<Button>
<SearchIcon data-icon="inline-start"/>
Search
</Button>
<Button>
Next
<ArrowRightIcon data-icon="inline-end"/>
</Button>
```
---
## No sizing classes on icons inside components
Components handle icon sizing via CSS. Don't add `size-4`, `w-4 h-4`, or other sizing classes to icons inside `Button`, `DropdownMenuItem`, `Alert`, `Sidebar*`, or other shadcn components. Unless the user explicitly asks for custom icon sizes.
**Incorrect:**
```tsx
<Button>
<SearchIcon className="size-4" data-icon="inline-start" />
Search
</Button>
<DropdownMenuItem>
<SettingsIcon className="mr-2 size-4" />
Settings
</DropdownMenuItem>
```
**Correct:**
```tsx
<Button>
<SearchIcon data-icon="inline-start" />
Search
</Button>
<DropdownMenuItem>
<SettingsIcon />
Settings
</DropdownMenuItem>
```
---
## Pass icons as component objects, not string keys
Use `icon={CheckIcon}`, not a string key to a lookup map.
**Incorrect:**
```tsx
const iconMap = {
check: CheckIcon,
alert: AlertIcon,
}
function StatusBadge({ icon }: { icon: string }) {
const Icon = iconMap[icon]
return <Icon />
}
<StatusBadge icon="check" />
```
**Correct:**
```tsx
// Import from the project's configured iconLibrary (e.g. lucide-react, @tabler/icons-react).
import { CheckIcon } from "lucide-react"
function StatusBadge({ icon: Icon }: { icon: React.ComponentType }) {
return <Icon />
}
<StatusBadge icon={CheckIcon} />
```
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# Styling & Customization
See [customization.md](../customization.md) for theming, CSS variables, and adding custom colors.
## Contents
- Semantic colors
- Built-in variants first
- className for layout only
- No space-x-* / space-y-*
- Prefer size-* over w-* h-* when equal
- Prefer truncate shorthand
- No manual dark: color overrides
- Use cn() for conditional classes
- No manual z-index on overlay components
---
## Semantic colors
**Incorrect:**
```tsx
<div className="bg-blue-500 text-white">
<p className="text-gray-600">Secondary text</p>
</div>
```
**Correct:**
```tsx
<div className="bg-primary text-primary-foreground">
<p className="text-muted-foreground">Secondary text</p>
</div>
```
---
## No raw color values for status/state indicators
For positive, negative, or status indicators, use Badge variants, semantic tokens like `text-destructive`, or define custom CSS variables — don't reach for raw Tailwind colors.
**Incorrect:**
```tsx
<span className="text-emerald-600">+20.1%</span>
<span className="text-green-500">Active</span>
<span className="text-red-600">-3.2%</span>
```
**Correct:**
```tsx
<Badge variant="secondary">+20.1%</Badge>
<Badge>Active</Badge>
<span className="text-destructive">-3.2%</span>
```
If you need a success/positive color that doesn't exist as a semantic token, use a Badge variant or ask the user about adding a custom CSS variable to the theme (see [customization.md](../customization.md)).
---
## Built-in variants first
**Incorrect:**
```tsx
<Button className="border border-input bg-transparent hover:bg-accent">
Click me
</Button>
```
**Correct:**
```tsx
<Button variant="outline">Click me</Button>
```
---
## className for layout only
Use `className` for layout (e.g. `max-w-md`, `mx-auto`, `mt-4`), **not** for overriding component colors or typography. To change colors, use semantic tokens, built-in variants, or CSS variables.
**Incorrect:**
```tsx
<Card className="bg-blue-100 text-blue-900 font-bold">
<CardContent>Dashboard</CardContent>
</Card>
```
**Correct:**
```tsx
<Card className="max-w-md mx-auto">
<CardContent>Dashboard</CardContent>
</Card>
```
To customize a component's appearance, prefer these approaches in order:
1. **Built-in variants**`variant="outline"`, `variant="destructive"`, etc.
2. **Semantic color tokens**`bg-primary`, `text-muted-foreground`.
3. **CSS variables** — define custom colors in the global CSS file (see [customization.md](../customization.md)).
---
## No space-x-* / space-y-*
Use `gap-*` instead. `space-y-4``flex flex-col gap-4`. `space-x-2``flex gap-2`.
```tsx
<div className="flex flex-col gap-4">
<Input />
<Input />
<Button>Submit</Button>
</div>
```
---
## Prefer size-* over w-* h-* when equal
`size-10` not `w-10 h-10`. Applies to icons, avatars, skeletons, etc.
---
## Prefer truncate shorthand
`truncate` not `overflow-hidden text-ellipsis whitespace-nowrap`.
---
## No manual dark: color overrides
Use semantic tokens — they handle light/dark via CSS variables. `bg-background text-foreground` not `bg-white dark:bg-gray-950`.
---
## Use cn() for conditional classes
Use the `cn()` utility from the project for conditional or merged class names. Don't write manual ternaries in className strings.
**Incorrect:**
```tsx
<div className={`flex items-center ${isActive ? "bg-primary text-primary-foreground" : "bg-muted"}`}>
```
**Correct:**
```tsx
import { cn } from "@/lib/utils"
<div className={cn("flex items-center", isActive ? "bg-primary text-primary-foreground" : "bg-muted")}>
```
---
## No manual z-index on overlay components
`Dialog`, `Sheet`, `Drawer`, `AlertDialog`, `DropdownMenu`, `Popover`, `Tooltip`, `HoverCard` handle their own stacking. Never add `z-50` or `z-[999]`.
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# Database
DATABASE_URL=sqlite:data/app.db
# Auth — portal SSO (prod) или локальный режим (dev)
# AUTH_REQUIRED=true → JWT от auth-portal, app id `fw`
AUTH_REQUIRED=false
AUTH_JWT_SECRET=dev-secret-change-me
AUTH_ISSUER=https://auth.shnt.top
AUTH_PORTAL_URL=http://localhost:5175
JWT_TTL_HOURS=24
# Frontend (Vite) — apps/web/.env.local
# VITE_AUTH_ENABLED=true
# VITE_AUTH_PORTAL_URL=http://localhost:5175
# ReUI PRO (apps/web/components.json → @reui Authorization)
# Ключ: https://reui.io/docs/license-setup — класть в apps/web/.env.local (gitignored)
REUI_LICENSE_KEY=
# EvoBGP integration (source of prefix lists)
# EVOBGP_API_URL=https://bgp.example.com
# EVOBGP_INTEGRATION_TOKEN=
# Server
SERVER_PORT=8080
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# Node / pnpm monorepo
node_modules/
.pnpm-store/
.turbo/
apps/web/node_modules/
apps/web/dist/
apps/web/.tanstack/
apps/api/dist/
packages/*/node_modules/
packages/*/dist/
# Data
data/
*.db
*.db-shm
*.db-wal
# Env / secrets
.env
.env.local
apps/web/.env.local
# IDE
.idea/
.vscode/
*.swp
# OS
.DS_Store
Thumbs.db
# Build
version.txt
*.tsbuildinfo
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{
"mcpServers": {
"reui": {
"type": "http",
"url": "https://mcp.reui.io/api/mcp"
}
}
}
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---
name: reui
description: Use the ReUI registry from your AI agent - find, install, and correctly use ReUI components (the 17 free building blocks like data-grid, kanban, filters), their free examples, premium blocks, and Motion Icons. Applies in any project using ReUI, the @reui registry, REUI_LICENSE_KEY, or any shadcn project where the user asks for premium blocks, data grids, kanban boards, dashboards, or full pages. Pairs with the free ReUI MCP server for live, scored registry search and inline component APIs.
user-invocable: false
allowed-tools: Bash(npx shadcn@latest *), Bash(pnpm dlx shadcn@latest *), Bash(bunx --bun shadcn@latest *)
---
> **ReUI skill version `42d70dcc3d`.** If the ReUI MCP's `get_agent_skill` reports a newer `version`, re-run the ReUI installer (see `get_agent_skill` -> `install.recommended`) to update this skill. Cloud/tools-only agents have no local file and always read the latest - they can ignore this.
# ReUI for Agents
ReUI is a shadcn-compatible registry. It ships four things you **reuse** - never redesign:
- **components** - the 17 ReUI building blocks with real APIs: `data-grid`, `kanban`, `filters`, `date-selector`, `tree`, `stepper`, ... (free)
- **examples** - free `c-*` single-pattern use-cases of a component (`c-kanban-1`); install one and read it to see exact composition
- **blocks** - premium full-page sections that compose components (`data-grid-2`, `pricing-page-1`); Pro or Ultimate license at install
- **icons** - Motion Icons in 4 styles, static + hover-animated variants; Ultimate license at install
The skill is free and this MCP is free to use; it just needs a ReUI account. On first use your agent opens a browser "Sign in with ReUI" prompt (a free account is created if you don't have one). Free covers components and examples with a daily request allowance; a Pro or Ultimate license unlocks premium blocks and Motion Icons and removes the limit (see [rules/registry.md](./rules/registry.md)). The same account and skill work in every agent and service the MCP connects to - this skill is agent-agnostic.
Skill + MCP are a team: this skill is the workflow (how to find, install, read the API, and adapt by reuse); the MCP is the live data and the hands (search, get_component, install commands). Your job: find the right item, install it with the shadcn CLI, read its real API, and **adapt by reuse** - wire real data and theme it; do not hand-roll or restyle what ReUI already provides. This skill **layers on the shadcn skill**: follow that for generic rules (spacing, `cn()`, semantic colors, forms); follow this for everything ReUI-specific.
## The core loop (MCP-native)
1. **Find** - call the ReUI MCP `search` tool with the user's intent. It returns a ranked, scored list across components/examples/blocks/icons, each with an `install` command, `previewUrl`, `docsUrl`, and `componentsUsed`. Pass hints (`type`, `component`, `category`, `features`, `free`) when you can infer them.
2. **Install** - run the returned command non-interactively (`npx shadcn@latest add @reui/<name> --yes`). The CLI resolves deps, aliases, and the base/style from `components.json`. See [cli.md](./rules/cli.md).
3. **Read the API (on your base)** - first note your base from `components.json` -> `style` (`base-nova` -> Base UI, `radix-nova` -> Radix UI). For each component an item uses, call `get_component(name)` and read its **inline `api`** (no web fetch); then `get_examples(name)` to install a worked example and copy its composition - the installed files are already in your base. Whenever you work with a component's API, also **share its `docsUrl`** (the primitive's API documentation page) with the user so they have the full reference. See [components.md](./rules/components.md).
4. **Adapt (reuse-first)** - swap demo data for real data, fix icon imports, align tokens. Do not redesign. See [adapting.md](./rules/adapting.md).
**Always show the preview.** Every item a tool returns carries a `previewUrl` (a live preview page). Whenever you list, recommend, or present ReUI items to the user - blocks, components, examples, or icons, whether from `search`, `search_icons`, `list_components`, `compose_page`, or any getter - include each item's `previewUrl` so they can SEE it before installing. Blocks and examples open an individual live preview; icons and components link to their live category/component page. Never present an item without its preview link.
If the ReUI MCP is not configured, fall back to `npx shadcn@latest search @reui -q "..."` then `add` - but the MCP gives scored matches + inline APIs; prefer it.
## Commands
Run ReUI as explicit slash commands (via the ReUI MCP) **or** just ask in plain language - both run the same workflow.
| Command | Invoke | Does |
| ----------- | ------------------------------ | ------------------------------------------------------------------------------------------------------------------ |
| **build** | `/mcp__reui__build <what>` | Compose a page/section/feature from ReUI: plan → install → read API → adapt → craft → audit. |
| **add** | `/mcp__reui__add <item>` | Find & install one component/example/block/icon and wire it in. |
| **fix** | `/mcp__reui__fix [target]` | Diagnose & fix ReUI usage: wrong/undocumented props, base/radix mismatch, missing states, a11y/scroll. |
| **improve** | `/mcp__reui__improve [target]` | Refine + extend existing ReUI UI to a production-exceptional bar (hierarchy, density, states, responsive, motion). |
Invocation differs slightly per agent (`/mcp__reui__build` in Claude Code/Cursor/Windsurf, `/mcp.reui.build` in VS Code). No command surface? Just describe what you want - this skill drives the identical loop.
## When to reach for ReUI vs plain shadcn
| Need | Reach for |
| -------------------------------------------------------------------- | ------------------------------------------------------------------------- |
| A full page or section (dashboard, billing, auth, pricing, settings) | `compose_page` first (plans sections + best blocks), then ReUI **blocks** |
| A data table with sorting/filtering/pagination/virtualization | the **data-grid** component (never hand-roll a `<table>`) |
| A drag-and-drop board | the **kanban** component |
| Advanced column filtering, date range, tree, stepper, ... | the matching ReUI **component** |
| A single generic control already in shadcn (Button, Dialog, Select) | plain **shadcn** |
## Detailed references
- [rules/registry.md](./rules/registry.md) - the four types, the @reui registry, base/radix, free vs premium + license
- [rules/workflow.md](./rules/workflow.md) - the find -> install -> read-API -> adapt loop (most important)
- [rules/components.md](./rules/components.md) - the 17 components, the data-grid contract, base vs radix
- [rules/adapting.md](./rules/adapting.md) - reuse-first: preserve the design (no over-customizing), reuse examples + a block's own elements, real data, don't invent APIs
- [rules/craft.md](./rules/craft.md) - make it exceptional: point of view, hierarchy, density, states, responsive, motion, the bar
- [rules/quality.md](./rules/quality.md) - security, accessibility, and scroll gates (the done gate)
- [rules/styling.md](./rules/styling.md) - ReUI extended tokens, theme adaptation, density
- [rules/icons.md](./rules/icons.md) - portable icons, swapping imports, Motion Icons (static + animated)
- [tools.md](./tools.md) - the ReUI MCP: golden path, the 19 tools, token rules, result shapes, errors
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# Adapting installed ReUI code (reuse-first, no AI slop)
ReUI items ship production-quality. Your job is to **adapt by reuse** - wire real data and fit the app - not to redesign or hand-roll. The output should look like ReUI built it for this product.
## Preserve the design - don't over-customize
The design IS the product. A ReUI block/component encodes senior-designer decisions: spacing, hierarchy, density, color treatment, and component choices. The fastest way to turn a premium block back into generic AI slop is to "improve" its look - so don't.
- Change **data, copy, and props**; keep the **structure and styling** it ships with. Make the **smallest** change that wires the real data. If your diff touches `className` / JSX structure more than data / props, you are over-customizing - stop and reuse.
- Don't swap ReUI components for hand-rolled ones, restructure the layout, re-skin spacing / radius / colors, or add decorative chrome. Let the installed components carry the default spacing, radius, sizing, icon rhythm, density, and state styling; add custom Tailwind only when a component genuinely lacks a contract you need.
- Want a different look? `search` for a block whose design already fits and reuse that - don't restyle this one into a new design.
## Reuse the parts: examples and the block's own elements
- **Examples are building parts.** A free `c-*` example is a correct, single-pattern composition you can reuse. Before composing from scratch, `get_examples(component)`, install the closest one, and reuse its wiring - assemble UI from examples instead of hand-rolling what an example already shows.
- **Reuse a block's own elements.** Need more rows, cards, items, or sections than ship by default? Repeat the block's **existing** element by mapping real data through the same markup - never invent parallel markup that drifts from its design. Need a variant (empty / loading / expanded)? Derive it from an element the block already has.
## Don't invent (read, don't guess)
- Never write a prop, variant value, import path, or `@reui/...` name you didn't read in a component's inline `api`, an installed example, or a `search` result. If you didn't see it, treat it as nonexistent - call `get_component` / `get_examples` / `search` first, or run the MCP `validate_usage` tool to check planned names + props against the docs before writing code.
- If a getter returns `found: false` or `search` returns nothing, say so and fall back (plain shadcn, or ask) - never fabricate an install command or an API.
## What to change vs leave alone
- **Change:** the item's own data, copy, props, and layout to fit the app.
- **Leave alone:** installed component files, hooks, and the shared theme - do not edit vendored ReUI internals; change behavior through props and the documented API.
- Blocks are **portable React** - no `next/link`, `next/image`, or other framework-runtime imports inside them. Keep them portable.
## Demo data -> real data
- Replace every placeholder with the user's real data. Model it as **typed data structures** and **map over arrays** - never duplicate JSX per row/card. Keep small block-specific formatters next to the data.
- Wire the real source (columns, fields, fetch). For `data-grid`, implement the server fetch contract if the user needs server-side data.
- **Type from the component API, derive during render.** Type domain state through the component's own types - e.g. map status to `BadgeProps["variant"]` via a typed `Record<Status, …>` - instead of stringly-typed values. Compute view state during render; don't mirror derived data into `useState`/`useEffect`.
- **Adapt on the right base.** Use the API for the project's base (Base UI vs Radix - see [components.md](./components.md)); the installed files are already base-correct, so reuse their shape rather than translating from memory.
## Believable content (no AI tells)
- Use realistic labels, counts, timestamps, and statuses that map to a real workflow.
- No decorative buttons, fake tabs, meaningless toggles, equal-weight card walls, empty gradients, ornamental icons, or generic SaaS filler. Every element should do something.
## Operational surfaces (settings / profile / admin)
Pick ONE archetype and keep the family consistent: a vertical rail (3-6 sections), horizontal tabs (5-8), or a frame/stack. Prefer `frame` for tool-like surfaces, a card for profile-like ones. Don't mix archetypes in one surface.
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# CLI: registry setup, license, non-interactive install
## Registry setup (one-time, per project)
Free items (the 17 components and all `c-*` examples) need only the plain string registry in `components.json`:
```json
{ "registries": { "@reui": "https://reui.io/r/{style}/{name}.json" } }
```
Premium items (blocks; Motion Icons and templates) require a ReUI license at install:
1. Add the key to `.env.local`:
```bash
REUI_LICENSE_KEY=your-license-key
```
2. Switch `components.json` to the authenticated object form:
```json
{
"registries": {
"@reui": {
"url": "https://reui.io/r/{style}/{name}.json",
"headers": { "Authorization": "Bearer ${REUI_LICENSE_KEY}" }
}
}
}
```
The shadcn CLI expands `${REUI_LICENSE_KEY}` from `.env.local` inside `components.json`, but an MCP client config never expands variables, so a ReUI MCP server config must carry the raw token instead (for example `reui_pat_your_token_here`).
The MCP `get_project_context` tool returns the right config. Full guide: https://reui.io/docs/registry
## Installing
Use the project's package runner (check `packageManager`):
```bash
npx shadcn@latest add @reui/<name> --yes # npm
pnpm dlx shadcn@latest add @reui/<name> --yes # pnpm
bunx --bun shadcn@latest add @reui/<name> --yes # bun
```
`--yes` skips confirmation prompts. The CLI auto-detects the package manager from the lockfile (there is no `--package-manager` flag). It also resolves the correct base+style variant from `components.json`, so do not pass a style.
## Handling prompts and conflicts
- **Always pass `--yes`** so the CLI does not block on confirmation prompts.
- **Do NOT pass `--overwrite` by default.** If the CLI reports an existing file, read the output and resolve deliberately: install under a different name, adjust the path, or ask the user. Only use `--overwrite` when the user explicitly wants to replace a file.
- **Preview first when touching an existing project**: `npx shadcn@latest add @reui/<name> --dry-run` shows what would change; `--diff <file>` shows a specific file's diff. Use these before overwriting.
- Run from the **project root** so `components.json` and `.env.local` are found.
## Free vs premium boundary
- Public, no key: `c-*` examples and the 17 components (`@reui/data-grid`, `@reui/badge`, ...) that those examples depend on.
- Key required at install: blocks (`@reui/<category>-N`) need a Pro or Ultimate license; Motion Icons (`@reui/icons/...`) and templates need Ultimate.
If an install 401/403s, the license key is missing, invalid, or the plan does not cover that resource (blocks: Pro or higher; icons and templates: Ultimate). Point the user to https://reui.io/account (their key) or https://reui.io/pricing (upgrade).
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# ReUI components
The 19 ReUI building blocks: `alert`, `autocomplete`, `badge`, `data-grid`, `date-selector`, `event-calendar`, `filters`, `frame`, `gantt`, `icon-stack`, `kanban`, `number-field`, `phone-input`, `rating`, `scrollspy`, `sortable`, `stepper`, `timeline`, `tree`. Examples and blocks are composed from these.
**Rule one: never guess a component's API. Read it first.** Call **`get_component(name)`** for its inline `api` (props + usage, no web fetch), and **share the result's `docsUrl`** (the component's API documentation page) with the user whenever you work with that component's API, so they have the full reference (the `/llms.txt` index is a further fallback). Then call **`get_examples(name)`** to install a worked example and copy real composition. The contracts below are first-try orientation (required props, composition shape, the one gotcha); the inline `api` is the full reference. No single block fits? Compose: search the components you need, read each `get_component`, install a `get_examples` example per component, and adapt.
## data-grid (the flagship - read its API every time)
`data-grid` wraps TanStack Table v8. It is NOT a styled `<table>` and does NOT take `data`/`columns` props directly. The contract:
- Build a TanStack table instance with `useReactTable(...)` (columns, data, the feature models you need: sorting, pagination, row selection).
- Pass that instance to `<DataGrid table={table} recordCount={total}>`.
- Compose the body with `DataGridTable` inside `DataGrid`, and enable features through `tableLayout` (e.g. `{ headerSticky: true, columnsResizable: true }`), not ad-hoc classes.
- Server-side data uses the documented fetch shape (`recordCount` is the total for pagination).
```tsx
const table = useReactTable({
data,
columns,
getCoreRowModel: getCoreRowModel(),
// add sorting/pagination/selection models per the API
})
<DataGrid table={table} recordCount={data.length}>
<DataGridTable />
</DataGrid>
```
Common mistakes:
- **Incorrect:** `<DataGrid data={rows} columns={cols} />` - these props do not exist. **Correct:** build a `useReactTable` instance and pass `table={table}` + `recordCount`.
- **Incorrect:** a raw `<table>` / hand-rolled pagination. **Correct:** use `data-grid`; read its API for sticky header, pagination, virtualization, row selection.
- **Incorrect:** styling rows/cells with arbitrary classes. **Correct:** drive layout via `tableLayout` and the documented `ColumnMeta` (e.g. `cellClassName`, `headerTitle`).
## event-calendar
**Required:** events via `events`/`onEventsChange` (controlled) or `defaultEvents` (uncontrolled), plus a height on the root.
**Shape:**
```tsx
<EventCalendar defaultEvents={events} defaultView="month" className="h-[560px]">
<EventCalendarNav />
<EventCalendarContent />
</EventCalendar>
```
**Gotcha:** headless-first: `EventCalendarContent` renders the active view (month/week/day/days/agenda; a resource view activates when `resources` is passed) - there is no per-view JSX to compose. Events are `{ id, title, start, end (exclusive), allDay?, color?, recurrence?, resourceId? }`. Mutations flow through `onEventUpdate`/`canDropEvent` (return `false` to reject); the root needs an explicit height because it is a min-h-0 flex column.
## gantt
**Required:** `resources` (the left tree) plus bars via `events`/`defaultEvents` attached by `resourceId`.
**Shape:**
```tsx
<Gantt defaultEvents={bars} resources={tasks} defaultScale="month" className="h-[480px]">
<GanttNav />
<GanttView />
</Gantt>
```
**Gotcha:** bars move along the time axis only (never across rows) and are all-day spans with exclusive `end`; `progress` is 0-100. Scales are `day | week | month | quarter | year`. Zoom control, infinite scroll, summary rollups, and row checkboxes are ON by default - turn off what you do not need. Same `onEventUpdate`/`canDropEvent` commit pipeline as `event-calendar`; the root needs an explicit height.
## kanban
**Required:** `value` (`Record<string, T[]>`), `onValueChange`, `getItemValue`
**Shape:**
```tsx
<Kanban value={cols} onValueChange={setCols} getItemValue={(i) => i.id}>
<KanbanBoard>
{Object.entries(cols).map(([id, items]) => (
<KanbanColumn key={id} value={id}>
<KanbanColumnHandle><h3>{id}</h3></KanbanColumnHandle>
<KanbanColumnContent value={id}>
{items.map((i) => (
<KanbanItem key={i.id} value={i.id}>
<KanbanItemHandle>{i.title}</KanbanItemHandle>
</KanbanItem>
))}
</KanbanColumnContent>
</KanbanColumn>
))}
</KanbanBoard>
<KanbanOverlay><div className="bg-muted size-full rounded-md" /></KanbanOverlay>
</Kanban>
```
**Gotcha:** state is `Record<columnId, T[]>`. Each `KanbanColumnContent value` must match its parent `KanbanColumn value`. Omit `KanbanOverlay` and the drag preview silently breaks.
## sortable
**Required:** `value` (`T[]`), `onValueChange`, `getItemValue`
**Shape:**
```tsx
<Sortable value={items} onValueChange={setItems} getItemValue={(i) => i.id}>
{items.map((i) => (
<SortableItem key={i.id} value={i.id}>
<SortableItemHandle><GripVertical /></SortableItemHandle>
{i.label}
</SortableItem>
))}
</Sortable>
```
**Gotcha:** a flat 1D reorder list (not columns - that is `kanban`). `getItemValue` must return a stable, unique string. Pass `layout="grid"` or `layout="nested"` for non-list layouts.
## filters
**Required:** `filters` (`Filter[]`), `fields` (`FilterFieldConfig[]`), `onChange`
**Shape:**
```tsx
const [filters, setFilters] = useState<Filter[]>([
createFilter("priority", "is_any_of", ["low"]),
])
const fields: FilterFieldConfig[] = [
{ key: "priority", label: "Priority", type: "multiselect",
options: [{ value: "low", label: "Low" }, { value: "high", label: "High" }] },
]
<Filters filters={filters} fields={fields} onChange={setFilters} />
```
**Gotcha:** always build initial filters with `createFilter(field, operator, values)` - it generates the required `id`. Never hand-construct a `Filter` object. Pairs naturally with `data-grid`.
## date-selector
**Required:** none, but wire `onChange` to capture the value.
**Shape:**
```tsx
const [value, setValue] = useState<DateSelectorValue | undefined>()
<DateSelector value={value} onChange={setValue} label="Due date" />
```
**Gotcha:** the value is a structured `DateSelectorValue` (period / operator / start+end dates), NOT a `Date` - never pass a raw `Date`. Use `allowRange={false}` to lock single-date picking. Read `get_component("date-selector")` for the value shape.
## tree
**Required:** `tree` (a `@headless-tree/core` instance you construct)
**Shape:**
```tsx
<Tree tree={tree}>
{tree.getItems().map((item) => (
<TreeItem key={item.getId()} item={item}>
<TreeItemLabel />
</TreeItem>
))}
</Tree>
```
**Gotcha:** `Tree` is a styled shell - it takes a headless-tree instance via `tree`, NOT `data`/`items` props. Build the instance with `@headless-tree/react`. External API: https://headless-tree.lukasbach.com/
## stepper
**Required:** `StepperItem step` (number), `StepperContent value` (number)
**Shape:**
```tsx
<Stepper defaultValue={1}>
<StepperNav>
<StepperItem step={1}>
<StepperTrigger><StepperIndicator>1</StepperIndicator></StepperTrigger>
<StepperSeparator />
</StepperItem>
<StepperItem step={2}>
<StepperTrigger><StepperIndicator>2</StepperIndicator></StepperTrigger>
</StepperItem>
</StepperNav>
<StepperPanel>
<StepperContent value={1}>Step 1 content</StepperContent>
<StepperContent value={2}>Step 2 content</StepperContent>
</StepperPanel>
</Stepper>
```
**Gotcha:** steps are 1-indexed. Without `StepperPanel` + `StepperContent` you render the nav trail but no body. Put `StepperSeparator` in every `StepperItem` except the last.
## timeline
**Required:** `TimelineItem step` (number)
**Shape:**
```tsx
<Timeline>
<TimelineItem step={1}>
<TimelineHeader>
<TimelineDate>March 2024</TimelineDate>
<TimelineTitle>Project initialized</TimelineTitle>
</TimelineHeader>
<TimelineIndicator />
<TimelineSeparator />
<TimelineContent>Repo and architecture set up.</TimelineContent>
</TimelineItem>
</Timeline>
```
**Gotcha:** each item needs a unique `step`. `orientation` is `"vertical"` (default) or `"horizontal"`. This is a static event display, not interactive like `stepper`.
## autocomplete
**Required:** `items` (array; each item has at least `value`)
**Shape:**
```tsx
<Autocomplete items={items}>
<AutocompleteInput placeholder="Search..." />
<AutocompleteContent>
<AutocompleteEmpty>No results found.</AutocompleteEmpty>
<AutocompleteList>
{(item) => (
<AutocompleteItem key={item.value} value={item}>{item.label}</AutocompleteItem>
)}
</AutocompleteList>
</AutocompleteContent>
</Autocomplete>
```
**Gotcha:** `AutocompleteList` takes a render-prop `(item) => ReactNode`, NOT a mapped array of children. External API: https://base-ui.com/react/components/autocomplete
## phone-input
**Required:** none, but wire `onChange`.
**Shape:**
```tsx
<PhoneInput placeholder="Enter phone number" defaultCountry="US" value={value} onChange={setValue} />
```
**Gotcha:** `value`/`onChange` use an E.164 string (e.g. `"+14155551234"`), not a display-formatted string; `onChange` can fire `undefined`. `defaultCountry` is a 2-letter ISO code. Wraps `react-phone-number-input`.
## number-field
**Required:** wrap the controls in `NumberFieldGroup`.
**Shape:**
```tsx
<NumberField defaultValue={0}>
<NumberFieldScrubArea label="Quantity" />
<NumberFieldGroup>
<NumberFieldDecrement />
<NumberFieldInput />
<NumberFieldIncrement />
</NumberFieldGroup>
</NumberField>
```
**Gotcha:** import from `@/components/ui/number-field`. The accessible label goes on `NumberFieldScrubArea`, not `NumberField`. External API: https://base-ui.com/react/components/number-field
## rating
**Required:** `rating` (number)
**Shape:**
```tsx
<Rating rating={4.5} showValue editable onRatingChange={setRating} />
```
**Gotcha:** supports decimals (partial stars). Pass `editable` + `onRatingChange` for interactive input; omit both for a read-only display.
## scrollspy
**Required:** `targetRef` (the scroll container ref)
**Shape:**
```tsx
<Scrollspy targetRef={containerRef}>
<a href="#s1" data-scrollspy-anchor="s1">Section 1</a>
<a href="#s2" data-scrollspy-anchor="s2">Section 2</a>
</Scrollspy>
<div ref={containerRef}>
<div id="s1">...</div>
<div id="s2">...</div>
</div>
```
**Gotcha:** each link's `data-scrollspy-anchor` must match a section `id`. `targetRef` is the scrollable container (defaults to the window).
## frame
**Required:** `Frame` > `FramePanel`
**Shape:**
```tsx
<Frame>
<FramePanel>
<FrameHeader>
<FrameTitle>Title</FrameTitle>
<FrameDescription>Description</FrameDescription>
</FrameHeader>
<div className="p-5">Content</div>
<FrameFooter>Footer</FrameFooter>
</FramePanel>
</Frame>
```
**Gotcha:** a structured card shell for tool-like surfaces. `stacked` connects multiple panels with shared borders; `dense` removes panel padding; radius via the `--frame-radius` CSS variable.
## icon-stack
**Required:** one child icon
**Shape:**
```tsx
<IconStack aria-hidden="true">
<InboxIcon className="size-4" />
</IconStack>
```
**Gotcha:** isometric layered artwork for empty states and illustrations; style the inner icon via its own `className`. Mark purely decorative stacks `aria-hidden="true"` and keep the real label in surrounding copy.
## alert
**Required:** `Alert` > `AlertTitle`
**Shape:**
```tsx
<Alert variant="success">
<ShieldCheckIcon />
<AlertTitle>Security update</AlertTitle>
<AlertDescription>Enable two-factor authentication.</AlertDescription>
<AlertAction><Button size="xs">Update</Button></AlertAction>
</Alert>
```
**Gotcha:** shadcn-compatible API. `variant`: `default | destructive | info | success | warning | invert`. The non-default variants use ReUI extended color tokens (`--success`/`--info`/`--warning`/`--invert`), which the install adds. Defer generic alert rules to the shadcn skill.
## badge
**Required:** none (text child).
**Shape:**
```tsx
<Badge variant="success-light" size="sm">Success</Badge>
<Badge variant="outline" radius="full">Pill</Badge>
```
**Gotcha:** shadcn-compatible. Rich `variant` set (solid, `-outline`, `-light` per color), `size` `xs..xl`, `radius` `default | full`. Like `alert`, the color variants rely on ReUI extended tokens. Prefer `Badge` variants over raw color classes for statuses.
## base vs radix - write for the project's base
ReUI ships every component in two builds: `base` (Base UI) and `radix` (Radix UI). The install command and name are identical, and the CLI installs the build matching the project. But you must write/adapt code against the **right base**, because their APIs differ.
**Detect the base first.** Read `components.json` -> `style` and take the segment before the first `-`:
- `"style": "base-nova"` -> **Base UI**
- `"style": "radix-nova"` -> **Radix UI**
**Then use that base's API.** The deltas mirror shadcn's base-vs-radix split:
- Slot/composition: Base UI `render={<… />}` vs Radix `asChild`.
- `Select`: Base UI takes `items`; Radix uses `<SelectItem>` children.
- `ToggleGroup`: Base UI `multiple` boolean vs Radix `type="single" | "multiple"`.
The safest path is to **read the installed files and `c-*` examples** - they're already in your base, so reuse their wiring instead of guessing. When `get_component`'s inline `api` or an example shows the other base's shape, translate it to your base (or `validate_usage` to confirm). Defer the generic base/radix mechanics to the shadcn skill.
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# Craft: make ReUI UI exceptional, not generic
ReUI items ship senior-designer quality. Your adaptation has to hold that bar, so the result reads like a real product surface a team would keep - not a wireframe an AI generated. Use these alongside the reuse rules in [adapting.md](./adapting.md).
## Have a point of view
Pick an emotional register before you compose - calm, operational, premium, editorial, dense, energetic - and let layout, spacing, surface treatment, and icon behavior all reinforce it. One or two memorable decisions and restraint everywhere else beats ten generic ones. UI with no point of view reads as generated.
## Brutally clear hierarchy
One focal point per card or panel: the dominant metric or task first, its label second, supporting detail third. The first thing the eye lands on should be the right thing; secondary text must read as secondary. Borders, separators, and surfaces do real work to create 2-3 information bands - don't flatten everything to equal weight.
## Spacing rhythm and deliberate density
Gaps are a signal, not a default. Keep them intentional and consistent within a family (`gap-1`/`gap-2` for tight operational rows, larger gaps for section breaks), and smaller within a group than between groups. Match the surrounding ReUI density; don't pad an operational surface like a marketing page, and don't drift density mid-section. The composition should still feel authored in grayscale.
## Cover the real states (the usual miss)
A surface isn't done at the happy path. Compose, and wire:
- **Empty** - a purposeful empty state (short message + the primary action), never a blank panel.
- **Loading** - a **skeleton** that matches the real layout, not a centered spinner.
- **Error** - an inline, recoverable error with a retry, announced via `role="status"`/`aria-live`.
Derive these from an element the block already has (don't invent parallel markup), or `get_examples` for a state-specific example.
## Responsive by default
Mobile-first, not mobile-afterthought. In constrained rows/cards/sidebars, put `min-w-0` on the shrinking container and `truncate` long single-line labels; protect the primary label's width and let secondary content compress. Reflow layouts (multi-column -> single column) rather than just shrinking them. Desktop and mobile should both look designed.
## Motion, subtly
Motion should clarify, not decorate. Use ReUI Motion Icons on primary actions for a subtle hover cue; keep transitions short (~200-300ms) with calm easing; prefer a skeleton pulse over a spinner. No bouncing, no gratuitous entrance animations on every element.
## Real, activated content
Use believable, typed data (realistic labels, counts, timestamps, statuses that map to a real workflow) - never lorem or abstract filler. Every visible control does something: no decorative buttons, fake tabs, meaningless toggles, or stats with no job. It must still hold with long names, empty values, and crowded data.
## Avoid the AI tells
These instantly read as generated - don't ship them: equal-weight card walls, empty gradients, repetitive padding everywhere, generic enterprise copy, ornamental icons, and number tiles that don't earn their place.
## The bar
Before you finish, ask: **would a product team keep this instead of replacing it? Does it still feel strong after swapping in real content?** If not, reuse the shipped ReUI design harder - don't restyle it into something new - then run the [quality.md](./quality.md) gates.
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# Icons (ReUI delta over shadcn)
Follow the shadcn icon rules (use the project's configured `iconLibrary`, `data-icon` on icons inside `Button`, no sizing classes on icons inside components, pass icons as component objects not string keys). ReUI adds the following.
## Portable icons (library-agnostic)
ReUI components, examples, and blocks are authored to be icon-library-agnostic. When `iconLibrary` is set in `components.json`, the shadcn CLI installs each item's icons in **your** library automatically - you swap nothing. If an installed item's icons don't match your project (for example `iconLibrary` isn't set, so they came in from the item's demo library), change the **import source and component name** to your library, keeping the same icon-name semantics:
- `lucide` -> `lucide-react`
- `tabler` -> `@tabler/icons-react`
- `phosphor` -> `@phosphor-icons/react`
- `remix` -> `@remixicon/react`
- `hugeicons` -> `@hugeicons/react`
Don't assume `lucide-react`; read `iconLibrary` from `components.json`.
## Keep icons purposeful
Icons support the hierarchy, they don't replace it: keep them small, matched to the surrounding density, and decorative ones `aria-hidden="true"` (an icon-only control still needs an accessible label on the control). Don't add ornamental icons that do no job.
## Motion Icons (the `@reui/icons/...` set)
ReUI ships its own icon set in 4 styles (outline, solid, duotone, filled), each icon in two variants:
```bash
npx shadcn@latest add @reui/icons/default/<style>/<name> --yes # static
npx shadcn@latest add @reui/icons/animated/<style>/<name> --yes # hover-animated (motion/react)
```
Finding them via the MCP is free; installing requires an Ultimate license (`REUI_LICENSE_KEY`, see [cli.md](./cli.md)). Reach for a Motion Icon on a primary action when a subtle hover cue helps; keep motion restrained.
Finding icons:
- Several icons (the common case): **`search_icons(concepts[])`** - up to 24 concepts in one call, the best icons per concept with install commands. Pass `animated: true` to get only icons with a hover-animated Motion variant.
- One icon: `search` with `type: "icon"`.
- Icon results and `get_icon` carry `animated: true` and `installAnimated` when an animated variant exists - use those install strings, do not construct paths by hand.
- Every icon result carries a `previewUrl` (its live icon-category page) - **share it with the user** so they can SEE the icon before installing.
The `icon-stack` component composes multiple icons into a stacked display.
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# Quality gates (security, accessibility, scroll)
These are the **done gate**, not a nice-to-have: before you call any ReUI work finished, call the MCP `get_audit_checklist` tool and pass every item below (plus the craft bar in [craft.md](./craft.md)). Then typecheck and lint.
## Security
- Never `dangerouslySetInnerHTML`. Render data as text/components.
- External links (`target="_blank"`) must always pair `rel="noopener noreferrer"`.
- No real PII, secrets, or tokens in demo or committed code. Remote media only from sources the project already allows.
## Accessibility
- Implicit list/card items that navigate get real anchors with a standard hover affordance.
- Icon-only or numeric buttons need an `aria-label`; decorative icons get `aria-hidden`.
- Every non-submit button is `type="button"`.
- Keyboard + focus: everything interactive is reachable in a sensible Tab order with a visible focus ring; layers (dialogs/sheets/menus) trap focus and close on `Escape`. ReUI components ship standard keyboard behavior - read each component's inline `api` rather than re-implementing it.
- Announce async UI: loading and error messages use `role="status"` / `aria-live` so they're not silent to screen readers.
## Scroll mechanics
- Make scroll regions with a parent-owned height: a `min-h-0` + flex chain down to the scroll container. Never guess a `max-h`.
- The scroll container owns `overflow-auto`; ancestors stay `min-h-0` so the height resolves.
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# ReUI registry structure
ReUI is a shadcn-compatible registry with four entity types. **Examples and blocks are built FROM components** - reuse them, don't rebuild.
- **component** - one of the 17 ReUI building blocks with a real API (`data-grid`, `kanban`, `filters`, `date-selector`, `tree`, ...). Install directly (`@reui/data-grid`) or let it come in as a dependency of an example/block. Free. Read its API with `get_component(name)`.
- **example** - a free `c-*` single-pattern use-case of a component (`c-kanban-1`, `c-data-grid-3`). Install one and read it to copy real composition. Find a component's examples with `get_examples(name)`.
- **block** - a premium, full-page section that composes several components (`data-grid-2`, `pricing-page-1`). Pro or Ultimate license at install. Adapts to your active theme via semantic tokens.
- **icon** - Motion Icons in 4 styles (outline, solid, duotone, filled), static (`@reui/icons/default/<style>/<name>`) and hover-animated (`@reui/icons/animated/<style>/<name>`). Ultimate license at install. See [icons.md](./icons.md).
## The @reui registry
Install everything through the shadcn CLI: `npx shadcn@latest add @reui/<name> --yes`. The CLI reads the `@reui` registry from the project's `components.json`. Free items need only the plain string form:
```json
{ "registries": { "@reui": "https://reui.io/r/{style}/{name}.json" } }
```
Premium installs need the authenticated form + `REUI_LICENSE_KEY` in `.env.local` - see [cli.md](./cli.md). The MCP `get_project_context` tool returns the right config.
## Know your base: base or radix
ReUI ships every item in two builds - `base` (Base UI) and `radix` (Radix UI) - with mirrored names. The CLI installs the build matching your project automatically, but **you must write code against the right base's API**. Detect it from `components.json` -> `style`: the segment before the first `-` is the base (`base-nova` -> Base UI, `radix-nova` -> Radix UI). The installed files and `c-*` examples are already in your base - read them and adapt on that base. See [components.md](./components.md) for the API deltas.
**So the MCP's own `docsUrl` and `previewUrl` match your base**, send your `style` to the MCP: add `?style=<your components.json style>` to the ReUI MCP server URL (or set an `X-Reui-Style` header) in your MCP client config - set once, applies to every call. The MCP then resolves docs/preview links to YOUR library (`/docs/components/radix/...`, `/preview/radix/...` for a radix project) instead of the default base; `get_project_context` echoes back the style it currently sees so you can confirm it. Install commands are unaffected (the CLI already installs the right variant). If you notice the MCP returning `base` links for a `radix` project, tell the user to add `?style=` to the server URL.
Blocks adapt to your active theme through semantic tokens and CSS variables - change the theme and every block follows.
## Free vs premium
- **Free, no key:** the 17 components, all `c-*` examples, the ReUI MCP, and this skill.
- **Premium, license required at install:** blocks (Pro or Ultimate), Motion Icons and templates (Ultimate). Set `REUI_LICENSE_KEY` (see [cli.md](./cli.md)).
## Component API index
The canonical index of every component's API docs is **https://reui.io/llms.txt** (returned as `componentsApiUrl` in MCP results). Prefer the inline `api` from `get_component`; use the index/docs as the fallback.
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# Styling (ReUI delta over shadcn)
Follow the shadcn skill for the generic rules (semantic colors not raw values, `gap-*` not `space-y-*`, `size-*`, `cn()`, no manual `dark:` overrides, no overlay `z-index`). This file is only the ReUI-specific additions.
## ReUI extended semantic tokens
ReUI adds semantic tokens beyond shadcn's base set. Use these instead of raw colors for status and emphasis:
- `--success` / `--success-foreground`
- `--info` / `--info-foreground`
- `--warning` / `--warning-foreground`
- `--destructive-foreground` (paired with shadcn's `--destructive`)
- `--invert` / `--invert-foreground` (inverted surfaces)
Use them as Tailwind utilities (`bg-success text-success-foreground`, `text-warning`, ...). They are defined in the project's global CSS and registered with Tailwind (`@theme inline` on v4). If a token is missing in the project, add it to the global CSS file (never a new file) following the same `name` / `name-foreground` convention, exactly as the shadcn customization rules describe.
**Incorrect:** `<span className="text-green-600">Active</span>`
**Correct:** `<Badge variant="success">Active</Badge>` or `<span className="text-success">Active</span>`
## Blocks follow your theme
When you install a block it adapts to your active theme through the semantic tokens above and the project's CSS variables. Don't hardcode style-specific values into installed block code and don't fork it to "restyle" - change the theme via the CSS variables / a preset and every block follows. Want a different look? `search` for a block whose design already fits instead of re-skinning one.
## Density and typography rhythm
ReUI operational UI usually feels dense, not airy. Keep the gap between a title and its supporting description tight by default (`gap-0.5`, `space-y-1`, or `space-y-px`), and smaller than the gap between sections. Match the surrounding ReUI density when you add rows or fields; do not pad operational surfaces like a marketing page.
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# Workflow: find -> install -> read API -> adapt
The core ReUI loop. The MCP tells you what to install and gives you the API; the shadcn CLI installs it; you turn the installed files into correct, themed, data-wired code by **reuse**, not redesign.
## 1. Find (ReUI MCP `search` / `compose_page`)
**Full multi-section page ask?** Call `compose_page(intent, sections?)` FIRST, before searching block-by-block. It returns ordered sections, each with the best block for the intent (top pick + alternates); sections listed in `unavailableSections` have no real inventory - compose those from components, do not force a bad block.
For everything else, call `search` with the user's intent. Pass structured hints whenever you can infer them - you are an LLM, so do the parsing the server cannot:
- `type`: `"component"` (one of the 17 building blocks), `"example"` (a c-\* use-case), `"block"` (a full page/section), `"icon"`.
- `component`: the ReUI component the request implies (`"data-grid"`, `"kanban"`, ...).
- `category`, `features` (e.g. `["sortable","pagination"]`), `free`.
Example: "build a users management page with filters" -> `search({ query: "users management page with filters", type: "block", component: "data-grid", features: ["filters"] })`.
Each result has `install`, `previewUrl`, `docsUrl`, `componentsUsed`, `score`, `termCoverage`, and `whyMatch`. `score` is relative to the top hit (the top is ~100 by construction), not an absolute quality - compare results to each other, and show the user the top options if several score closely; do not silently guess. A low `termCoverage` means a weak match even with a high score - rephrase or widen.
**Always show the preview link.** Whenever you list or recommend items - from `search`, `search_icons`, `list_components`, `compose_page`, or a getter - include each item's `previewUrl` (a live preview page) so the user can SEE it before you install. Blocks and examples link to an individual live preview; icons and components to their live category/component page. This applies to every listing, not only a single pick.
## 2. Install (shadcn CLI)
Run the result's `install` command from the project root, non-interactively:
```bash
npx shadcn@latest add @reui/<name> --yes
```
The CLI reads `components.json`, installs the correct base+style variant, resolves `registryDependencies` (a block pulls in its components), installs npm deps, and rewrites aliases. Do not pass the base/style. See [cli.md](./cli.md).
## 3. Read the API (do not guess props)
Before writing code against any component an item uses:
1. The item's `componentDigests` already give a 1-line contract per component - often enough to wire it. For the full API, call **`get_component(names)`** with ALL of `componentsUsed` in ONE call (it accepts an array) and read each inline `api` - no web fetch. **Share the component's `docsUrl`** (its API documentation page) with the user whenever you work with that component's API, so they have the full reference; the `/llms.txt` index is a further fallback.
2. Call **`get_examples(name)`** for the free `c-*` examples of that component; install one and **read the added files** to copy the exact composition. This is the fastest correct path - the example shows real wiring you adapt, not invent.
3. About to write a prop you did not see in an `api` or installed file? Run **`validate_usage`** BEFORE writing the code - per-prop documented / notDocumented verdicts plus did-you-mean suggestions. notDocumented means read the API, not push on.
## 4. Adapt (reuse-first) - do not skip
Installing files is not the end, and redesigning them defeats the point. First note the project's **base** so you write the right API - read `components.json` -> `style` and take the segment before the first `-` (`base-nova` -> Base UI, `radix-nova` -> Radix UI), see [components.md](./components.md). After `add`:
1. **Read the added files**; keep the composition intact. For a block, verify the components are wired correctly (for `data-grid`: a `useReactTable` instance passed as `table`, `recordCount` set - see [components.md](./components.md)).
2. **Replace demo data with the user's real data** via typed structures (see [adapting.md](./adapting.md)).
3. **Fix icon imports** to the project's icon library (see [icons.md](./icons.md)).
4. **Align styling** to semantic tokens and the active theme - no raw colors (see [styling.md](./styling.md)).
5. **Validate before finalizing**: if your adaptation introduced components or props you did not read in an `api` or example, run `validate_usage` on them.
6. **Hit the craft bar** - clear hierarchy, deliberate density, the empty / loading / error states, subtle motion, and mobile-first responsiveness (see [craft.md](./craft.md)). Generic-looking output means you under-reused the design, not that it needs restyling.
7. **Pass the quality gates** (security, a11y, scroll) - call the MCP `get_audit_checklist` tool and clear every item (see [quality.md](./quality.md)).
8. **Typecheck / lint**.
## If no single block fits
Compose from components (`compose_page` tells you which sections have no block inventory via `unavailableSections`). `search` the components you need, read each `get_component` API, install a worked `get_examples` example for each, and assemble by adapting those examples. A block in the same category is a useful reference - install it and read its files to see how ReUI composes those components, then adapt.
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# ReUI MCP: full reference
The ReUI MCP (`https://mcp.reui.io`, Streamable HTTP) is free to use but needs a ReUI account: on first use the agent signs in with ReUI (a free account is created if the user has none), so every request is tied to an account. Free covers components and examples; a Pro or Ultimate license unlocks premium blocks and Motion Icons and removes the daily request limit. It does **discovery + guidance** (search, inline APIs, page planning, validation) and never serves source; the shadcn CLI does **installation**, and the license key lives there (the `@reui` entry in `components.json`, backed by `.env.local`). Goal: from the user's intent to correct, themed, data-wired ReUI code in the **fewest tokens and calls**, with **no guessing**.
## Golden path (token-optimal - follow this order)
Most tasks need 2-4 MCP calls and ZERO web fetches:
1. **`search(query, ...hints)`** -> pick the top 1-3 results. Each result already carries `install`, `previewUrl`, `docsUrl`, `componentsUsed`, `score`, `whyMatch`. The payload is complete - do not call another tool just to "confirm" a result.
2. **`get_component([...componentsUsed])`** in ONE batched call (one name or an array of up to 20) -> read each inline `api`. This **replaces** fetching docs pages. Often skippable: search responses carry `componentDigests`, a compact API contract per referenced component.
3. **`get_examples(component)`** -> install ONE returned `c-*` example, read the added files, copy the composition.
4. **`get_install_command(item)`** only to validate a name you are unsure of (results already include `install`). Run the install with the shadcn CLI (`--yes`).
5. **`get_audit_checklist()`** before declaring done.
If you already know the exact item name, skip `search`. Everything else is situational.
## The 5 task-specific tools (when to reach for each)
- **`compose_page`** - BEFORE building any full page (dashboard, settings, billing, landing). Pass the intent (and optionally the sections you want); it returns ordered sections, each with the best premium block for the intent (top pick + alternates). Sections with no real inventory are listed honestly in `unavailableSections` - compose those from components instead of forcing a bad block.
- **`search_icons`** - whenever you need icons, especially several. Batch up to 24 concepts in one call; each concept returns its best icons with install commands. Pass `animated: true` to get only icons that have a hover-animated Motion variant.
- **`validate_usage`** - BEFORE writing code with component names or props you have not read in an inline `api` or an installed example. It checks planned names + props against the indexed API docs and registry item names; returns did-you-mean suggestions and per-prop documented / notDocumented verdicts. Deterministic, no inference - a notDocumented prop means stop and read the API, not push on.
- **`whats_new`** - when your registry knowledge might be stale (a name 404s, the user mentions an item you don't know). Returns items added/removed per build, newest first.
- **`report_issue`** - when an installed item is actually broken (bad source, wrong dependency, broken preview). Goes straight to the ReUI team; rate-limited 5/hour. Not for usage questions.
## All 19 tools
`search`, `get_block`, `get_example`, `get_icon`, `list_block_groups`, `list_block_categories`, `list_example_categories`, `list_icon_categories`, `list_components`, `get_component`, `get_examples`, `search_icons`, `compose_page`, `validate_usage`, `whats_new`, `report_issue`, `get_install_command`, `get_project_context`, `get_audit_checklist`. The MCP serves the full parameter schemas; do not guess parameters beyond them.
## Token + speed rules
- **Batch `get_component`** - ONE call with the whole `componentsUsed` array, never N calls. Skip it entirely when `componentDigests` already answers the question.
- **Read source by installing** - the MCP serves no source. To read or analyze an item's real code, install it with the shadcn CLI and open the local files. Learn an API from the inline `api` / `componentDigests`, never by reading raw source.
- **Infer `search` hints yourself** (`type`, `component`, `category`, `features`, `free`) - hints shrink the result set and the tokens. Keep `limit` low; one right result beats ten.
- Run independent calls (and the shadcn install) concurrently in one turn - serial tool calls are the main source of slowness.
- Don't repeat a search for the same intent; don't call `list_*` to "see everything" - `search` is the entry point, `list_*` is only for browsing a taxonomy the user explicitly wants to explore.
- Prefer `get_component`'s inline `api` over `docsUrl` / `/llms.txt`. Fetch a web page only as a last resort.
## Result shapes (so you don't re-fetch)
- `score` is 0-100 RELATIVE to the top hit (the top is ~100 by construction), not absolute - compare results to each other.
- `termCoverage` (0-1) is the share of the query the item matched - low means a weak match even if the score looks high; rephrase or widen the search.
- Each result carries `whyMatch`, `install`, docs/preview URLs, and a `free` flag; premium items carry `requiredPlan` (`"pro"` for blocks, `"ultimate"` for icons).
- `componentDigests` is a top-level map: a compact API contract per referenced component - often enough to wire an item without a `get_component` call.
- Icon results and `get_icon` include `animated: true` and `installAnimated` when a hover-animated Motion variant exists (animated: `@reui/icons/animated/<style>/<name>`; static: `@reui/icons/default/<style>/<name>`).
## Error playbook
- **401** - the MCP requires a signed-in ReUI account. The client prompts "Sign in with ReUI" (OAuth) on first use; a free account is created if needed. For headless/CI, pass a personal token (`reui_pat_...`, created at https://reui.io/account/mcp) as `Authorization: Bearer`.
- **403 / locked result** - a valid account but the plan does not cover the item: premium blocks need Pro, Motion Icons need Ultimate. Point to https://reui.io/pricing (upgrade). Free accounts still get all components + examples.
- **429** - rate limited (120 requests/min per IP); back off, honor `Retry-After`.
- **not found** (`found: false`) - use the returned `suggestions`, or `search`; check `whats_new` if you suspect a stale name. Never run a fabricated install command.
## Fallbacks
- No ReUI MCP: `npx shadcn@latest search @reui -q "..."` then `add` (generic, no scoring / inline API).
- The shadcn project's own MCP also works over the `@reui` registry: https://ui.shadcn.com/docs/mcp.
Per-agent MCP setup: https://reui.io/docs/mcp
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# EvoFirewall — Руководство для ИИ
## Описание
EvoFirewall — централизованный firewall controller (Linux / MikroTik agents, blocklists, статистика). Интеграции: **auth-portal** (app id `fw`), **EvoBGP** (источник префиксов).
## Стек (план / scaffold)
- Monorepo: pnpm + turbo (`apps/*`, `packages/*`)
- `apps/web` — Vite + React + TanStack + shadcn **base-nova** + ReUI `@reui`
- `apps/api` — Fastify + Drizzle + SQLite
- Packages: `@evofw/ui`, `@evofw/shared`, `@evofw/db`
## ReUI PRO (обязательно)
| Что | Где |
|-----|-----|
| MCP | `user-reui` → https://mcp.reui.io/api/mcp (см. `.mcp.json`, `.cursor/mcp.json`) |
| Skill | `.agents/skills/reui` (v`42d70dcc3d`) — update: `curl -fsSL https://mcp.reui.io/install \| node -` |
| shadcn skill | `.agents/skills/shadcn` |
| Cursor rules | `.cursor/rules/reui-mcp.mdc`, `reui.mdc`, `shadcn-mcp.mdc`, `shadcn-ui-production.mdc`, `frontend-*.mdc` |
| Design contract | [`docs/ui-design-contract.md`](docs/ui-design-contract.md) — **surface: frame** |
| License | `apps/web/.env.local``REUI_LICENSE_KEY` |
| Registry | `apps/web/components.json``@reui` + Bearer |
Docs: [llms.txt](https://reui.io/llms.txt) · [MCP](https://reui.io/docs/mcp) · [License](https://reui.io/docs/license-setup) · [Agent skills](https://reui.io/docs/agent-skills)
UI workflow: `user-reui` search/compose → cite `previewUrl` → CLI из `apps/web` → adapt в `reui-kit``validate_usage`.
## Структура
```
apps/web/src/components/reui/ # CLI @reui/*
apps/web/src/components/reui-kit/ # ResourcePage, KpiStatGrid, …
packages/ui/ # shadcn primitives only
```
## Git
`origin` → https://git.shts.su/denozord/EvoFirewall.git
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# EvoFirewall
Централизованный firewall controller: Linux / MikroTik agents, blocklists, статистика.
Интеграции (план): **auth-portal** (SSO, app id `fw`), **EvoBGP** (источник префиксов).
## Стек (как CFDM / VPS Tracker)
- Monorepo: pnpm workspaces + turbo
- `apps/web` — Vite + React + TanStack Router/Query + shadcn/ui + ReUI
- `apps/api` — Fastify + Drizzle + SQLite
- `packages/ui``@evofw/ui` (shadcn primitives)
- `packages/shared` — Zod-контракты
- `packages/db` — схема и репозитории
## Структура
```
apps/
web/ # SPA
api/ # HTTP API
packages/
ui/ # shadcn CLI output
shared/ # contracts
db/ # drizzle
docs/
deploy/
scripts/
data/ # SQLite (gitignored)
```
## Быстрый старт
```bash
pnpm install
cp .env.example .env
# ReUI PRO: apps/web/.env.local уже с ключом (из CFDM) или скопируйте:
# copy ..\cloudflare-domain-manager\apps\web\.env.local apps\web\.env.local
```
Scaffold пока без Vite/Fastify — следующий шаг: init web/api по образцу CFDM.
## ReUI PRO
Skill + MCP установлены официальным инсталлером (`https://mcp.reui.io/install`):
- Skill: `.agents/skills/reui` (версия `42d70dcc3d`)
- MCP: `.mcp.json` / `.cursor/mcp.json``https://mcp.reui.io/api/mcp`
- Rules: `.cursor/rules/reui-mcp.mdc`, `reui.mdc`, `shadcn-*.mdc`, `frontend-*.mdc`
- Contract: [`docs/ui-design-contract.md`](docs/ui-design-contract.md) — surface **frame**
```bash
cd apps/web
# нужен REUI_LICENSE_KEY в .env.local (уже из CFDM)
pnpm dlx shadcn@latest add @reui/frame --yes
```
Обновить skill/MCP:
```bash
curl -fsSL https://mcp.reui.io/install | node -
```
Docs: https://reui.io/docs/license-setup · https://reui.io/llms.txt · https://reui.io/docs/mcp · https://reui.io/docs/agent-skills
## Git
```
origin https://git.shts.su/denozord/EvoFirewall.git
```
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{
"name": "@evofw/api",
"private": true,
"version": "0.0.0",
"type": "module",
"scripts": {
"dev": "echo \"api: scaffold — Fastify app not initialized yet\"",
"build": "echo \"api: scaffold — skip\"",
"lint": "echo \"api: scaffold — skip\"",
"test": "echo \"api: scaffold — skip\""
}
}
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{
"$schema": "https://ui.shadcn.com/schema.json",
"style": "base-nova",
"rsc": false,
"tsx": true,
"tailwind": {
"config": "",
"css": "../../packages/ui/src/styles/globals.css",
"baseColor": "neutral",
"cssVariables": true,
"prefix": ""
},
"iconLibrary": "lucide",
"rtl": false,
"registries": {
"@reui": {
"url": "https://reui.io/r/{style}/{name}.json",
"headers": {
"Authorization": "Bearer ${REUI_LICENSE_KEY}"
}
}
},
"aliases": {
"components": "@/components",
"utils": "@evofw/ui/lib/utils",
"ui": "@evofw/ui/components",
"lib": "@/lib",
"hooks": "@/hooks"
},
"menuColor": "default",
"menuAccent": "subtle"
}
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{
"name": "@evofw/web",
"private": true,
"version": "0.0.0",
"type": "module",
"scripts": {
"dev": "echo \"web: scaffold — Vite app not initialized yet\"",
"build": "echo \"web: scaffold — skip\"",
"lint": "echo \"web: scaffold — skip\"",
"test": "echo \"web: scaffold — skip\""
}
}
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