MCP Servers

stencil-mcp

Provides AI coding agents with version-aware StencilJS API references, decorator signatures, lifecycle hooks, and best practices to help them write idiomatic Stencil code.

Category

README

@stencil/mcp

A Model Context Protocol server that gives AI coding agents accurate, version-aware knowledge of a StencilJS project.

Proof-of-concept for stenciljs/core#6518.

Why

AI agents frequently suggest non-idiomatic Stencil code — e.g. manually adding a window.addEventListener in componentWillLoad instead of using the built-in @Listen() decorator, or mutating a @Prop. This server exposes Stencil's real API surface and best practices to the agent so it can self-correct, and tells it which Stencil version the project is actually running.

Tools

Tool	Purpose
`detect_stencil_version`	Resolves the version from `node_modules/@stencil/core` (authoritative) and the declared range in `package.json`.
`get_decorator_reference`	Signatures, idiomatic examples, and anti-patterns for `@Component`, `@Prop`, `@State`, `@Watch`, `@Event`, `@Listen`, `@Method`, `@Element`, `@AttachInternals`.
`get_lifecycle_reference`	The component lifecycle hooks and when each fires.
`get_best_practices`	Concrete "wrong vs right" rules so agents use built-in Stencil features.

All reference content is sourced from Stencil's own public runtime type declarations, so it matches the framework rather than guessing.

Usage

npm install && npm run build

Register with an MCP-capable client (Claude Desktop, Cursor, VS Code, etc.):

{
  "mcpServers": {
    "stencil": {
      "command": "npx",
      "args": ["-y", "@stencil/mcp"]
    }
  }
}

Develop

npm run build      # compile TypeScript
npm test           # unit tests (node:test)
node test/smoke.mjs # end-to-end MCP stdio test

License

MIT

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