@webjsdev/mcp

The webjs Model Context Protocol server for AI coding agents. A read-only MCP server (newline-delimited JSON-RPC 2.0 over stdio) that gives an agent the live introspection surface plus the framework knowledge layer it needs while editing a webjs app.

Run it

Register it with any MCP host (Claude, Cursor, etc.). It runs straight from npm, no install:

// .claude.json / .cursor/mcp.json
{
  "mcpServers": {
    "webjs": { "command": "npx", "args": ["@webjsdev/mcp"] }
  }
}

Every webjs scaffold wires this entry automatically. webjs mcp (the CLI subcommand) delegates to this same server, so both routes run identical code.

What it exposes

• Introspection tools (read-only, scoped to an appDir): list_routes, list_actions (with the /__webjs/action/<hash>/<fn> RPC endpoints), list_components, check (the structured webjs check violations). Each projects an existing @webjsdev/server data function and mutates nothing.
• Knowledge layer: an init mental-model primer, a docs retrieval tool, MCP resources (the agent-docs/* corpus + AGENTS.md as webjs-docs://*), and prompts (the recipes as guided workflows).
• source tool: reads the framework's own no-build source from node_modules/@webjsdev/*/src (read-only, traversal-guarded).

The docs corpus is bundled into the package at prepack, so npx @webjsdev/mcp is self-contained; in the monorepo it falls back to the live repo-root docs.

STDOUT is the JSON-RPC channel; every diagnostic goes to stderr.