Citadel MCP

A Model Context Protocol (MCP) server that bundles per-stack documentation tools for coding agents. Currently covers Next.js (App Router, Next.js 16), React, Turborepo, and Supabase guides.

Tools

• nextjs_docs -- Fetch Next.js official documentation by path. App Router on Next.js 16 only; Pages Router paths are rejected. Read the nextjs-docs://llms-index resource first to get the correct path.
• react_docs -- Fetch React official documentation by path. Read the react-docs://llms-index resource first to get the correct path.
• turborepo_docs -- Fetch Turborepo official documentation by path. Read the turborepo-docs://llms-index resource first to get the correct path.
• supabase_docs -- Fetch a Supabase guide by path. Scoped to /docs/guides/** content. Read the supabase-docs://guides-index resource first to get the correct path.

Resources

• nextjs-docs://llms-index -- Cached Next.js documentation index from nextjs.org/docs/llms.txt (App Router, Next.js 16).
• react-docs://llms-index -- Cached React documentation index from react.dev/llms.txt.
• turborepo-docs://llms-index -- Cached Turborepo documentation index from turborepo.dev/llms.txt.
• supabase-docs://guides-index -- Supabase guides index built from supabase.com/docs/sitemap.xml, filtered to /docs/guides/** and grouped by category.

MCP client config

Run the published package directly via npx:

{
  "mcpServers": {
    "citadel": {
      "command": "npx",
      "args": ["-y", "citadel-mcp"]
    }
  }
}

Or run a local checkout:

{
  "mcpServers": {
    "citadel": {
      "command": "node",
      "args": ["/absolute/path/to/citadel-mcp/dist/index.js"]
    }
  }
}

Local development

pnpm install
pnpm build
pnpm typecheck

The server entry point is dist/index.js. Run it directly over stdio for smoke testing:

node dist/index.js

License

MIT