Greyhaven Design System

A framework-agnostic React component library built on Radix UI, Tailwind CSS v4, and shadcn/ui patterns. Designed for LLM consumption with a Claude Skill, MCP server, and Storybook documentation.

Quick Start

pnpm install        # Install dependencies
pnpm dev            # Start showcase dev server (Next.js)
pnpm build          # Tokens + SKILL.md + production build
pnpm storybook      # Component catalog on http://localhost:6006

Project Structure

greyhaven-design-system/
├── components/ui/          # 37+ framework-agnostic React components
├── tokens/                 # W3C DTCG design tokens (source of truth)
│   ├── color.json
│   ├── typography.json
│   ├── spacing.json
│   ├── radii.json
│   ├── shadows.json
│   └── motion.json
├── skill/                  # Claude Skill (auto-generated)
│   ├── SKILL.md
│   └── install.sh
├── mcp/                    # MCP server for AI agents
│   └── server.ts
├── stories/                # Storybook stories (23 files, 8 categories)
├── lib/
│   ├── utils.ts            # cn() utility
│   └── catalog.ts          # Shared component catalog (used by MCP + SKILL.md)
├── scripts/
│   └── generate-skill.ts   # SKILL.md generator
├── app/                    # Next.js showcase app (demo only)
└── style-dictionary.config.mjs

Tech Stack

• Components: React 19, Radix UI, Tailwind CSS 4, CVA, tailwind-merge, clsx
• Icons: Lucide React
• Forms: React Hook Form + Zod
• Tokens: Style Dictionary v4 (W3C DTCG format)
• Docs: Storybook 10, auto-generated SKILL.md
• AI Integration: MCP server, Claude Skill

Framework-agnostic: Components have zero Next.js imports. They work with Vite, Remix, Astro, CRA, or any React framework.

---

Using the Design System with AI

The design system provides three things for AI agents:

File	What it is	Where it goes
SKILL.md	Full design system reference (tokens, all components, composition rules, extension protocol)	.claude/skills/ — works in Claude Code, Cursor, OpenCode, Anigravity, etc.
AGENTS.md	Short project instructions telling the AI how to use the design system (follows the agents.md convention)	Project root — copy as AGENTS.md, CLAUDE.md, .cursorrules, or .github/copilot-instructions.md
MCP Server	Runtime tools for looking up components, validating colors, suggesting components	Configured in .mcp.json

All are auto-generated from the same sources (tokens/*.json and lib/catalog.ts).

Quick Install (all at once)

./skill/install.sh /path/to/your/project

This copies (not symlinks) the following into your project:

1. SKILL.md → .claude/skills/greyhaven-design-system.md (full reference)
2. AGENTS.md → project root (project-level instructions)
3. Aspekta font files → public/fonts/

The script also prints the CSS @font-face block and MCP server config to add next.

Re-run the script after design system updates to refresh your copies.

SKILL.md (full reference)

The skill file gives any AI agent full design system context — every token, every component with props/variants/examples, composition rules, font setup, and the extension protocol.

It's a global standard — works with Claude Code, Cursor, OpenCode, Anigravity, and any tool that reads skill files.

# Via install script (recommended — also handles fonts + AGENTS.md)
./skill/install.sh /path/to/your/project

# Or copy manually
mkdir -p /path/to/your/project/.claude/skills
cp /path/to/greyhaven-design-system/skill/SKILL.md \
   /path/to/your/project/.claude/skills/greyhaven-design-system.md

AGENTS.md (project instructions)

Short, directive instructions that tell the AI agent how to work in the project — use TypeScript, use semantic tokens, reference the MCP tools, etc. Follows the agents.md convention so it works with most AI coding tools out of the box.

Copy it to your project root under whichever name your tool reads:

# Standard (agents.md convention — Cursor, OpenCode, Windsurf, Aider, etc.)
cp /path/to/greyhaven-design-system/skill/AGENTS.md /path/to/your/project/AGENTS.md

# Claude Code
cp /path/to/greyhaven-design-system/skill/AGENTS.md /path/to/your/project/CLAUDE.md

# Cursor (legacy)
cp /path/to/greyhaven-design-system/skill/AGENTS.md /path/to/your/project/.cursorrules

# GitHub Copilot
mkdir -p /path/to/your/project/.github
cp /path/to/greyhaven-design-system/skill/AGENTS.md /path/to/your/project/.github/copilot-instructions.md

Or use the install script, which copies AGENTS.md to the project root automatically.

Option C: MCP Server

The MCP server provides 5 tools for programmatic access:

Tool	Description
get_tokens(category?)	Returns token values (all, or filtered by: color, typography, spacing, radii, shadows, motion)
get_component(name)	Returns full component spec + source code
list_components(category?)	Lists components (all, or by: primitives, layout, overlay, navigation, data, feedback, form, composition)
validate_colors(code)	Checks code for raw hex values that should use design tokens
suggest_component(description)	Suggests components for a described UI need

Plus resources: tokens://all and component://{name} for each component.

Run directly:

pnpm mcp:start

Install in Claude Code (.mcp.json in your project root):

{
  "mcpServers": {
    "greyhaven": {
      "command": "npx",
      "args": ["tsx", "/absolute/path/to/greyhaven-design-system/mcp/server.ts"]
    }
  }
}

Install in Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "greyhaven": {
      "command": "npx",
      "args": ["tsx", "/absolute/path/to/greyhaven-design-system/mcp/server.ts"]
    }
  }
}

After adding, restart Claude Code / Claude Desktop. The tools will appear automatically.

Test it works:

echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}' | pnpm mcp:start

You should see a JSON response with "serverInfo":{"name":"greyhaven-design-system"}.

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Design Tokens

Tokens are defined in tokens/*.json using the W3C Design Token Community Group format. Style Dictionary v4 generates:

Output	Path	Purpose
CSS (light)	app/tokens/tokens-light.css	:root CSS custom properties
CSS (dark)	app/tokens/tokens-dark.css	.dark CSS custom properties
TypeScript	app/tokens/tokens.ts	Type-safe token constants
Markdown	app/tokens/TOKENS.md	Reference doc

pnpm tokens:build   # Regenerate all outputs from tokens/*.json

---

Storybook

23 story files across 8 categories with autodocs, theme switching (light/dark via toolbar), and all component variants.

pnpm storybook         # Dev server on http://localhost:6006
pnpm build-storybook   # Static build

---

Adding a New Component

1. Create components/ui/my-component.tsx following the CVA pattern (see button.tsx)
2. Add it to the catalog in lib/catalog.ts
3. Create a story in stories/<Category>/MyComponent.stories.tsx
4. Run pnpm skill:build to regenerate SKILL.md (or just pnpm build)
5. The MCP server picks it up automatically (reads lib/catalog.ts at runtime)

---

Scripts Reference

Script	Description
pnpm dev	Start Next.js showcase dev server
pnpm build	Full build: tokens + SKILL.md + Next.js
pnpm storybook	Storybook dev server on :6006
pnpm build-storybook	Static Storybook build
pnpm tokens:build	Regenerate CSS/TS/MD from token JSON files
pnpm skill:build	Regenerate skill/SKILL.md from tokens + catalog
pnpm mcp:start	Start the MCP server (stdio transport)
pnpm mcp:build	Type-check MCP server
pnpm lint	Run ESLint