Package Documentation MCP Server

An MCP (Model Context Protocol) server that provides LLMs with efficient access to package documentation across multiple programming languages.

Features

• Multi-Language Support:

  • Go packages via go doc
  • Python libraries via built-in help()
  • NPM packages via registry documentation (including private registries)

• Smart Documentation Parsing:

  • Structured output with description, usage, and examples
  • Focused information to avoid context overload
  • Support for specific symbol/function lookups
  • Fuzzy and exact search capabilities across documentation

• Advanced Search Features:

  • Search within package documentation
  • Fuzzy matching for flexible queries
  • Context-aware results with relevance scoring
  • Symbol extraction from search results

• Performance Optimised:

  • Built-in caching
  • Efficient parsing
  • Minimal memory footprint

Installation

npx -y mcp-package-docs

Installing via Smithery

To install Package Docs for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install mcp-package-docs --client claude

Usage

As an MCP Server

1. Add to your MCP settings configuration:

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

2. The server provides the following tools:

lookup_go_doc

Fetches Go package documentation

{
  "name": "lookup_go_doc",
  "arguments": {
    "package": "encoding/json", // required
    "symbol": "Marshal"        // optional
  }
}

lookup_python_doc

Fetches Python package documentation

{
  "name": "lookup_python_doc",
  "arguments": {
    "package": "requests",    // required
    "symbol": "get"          // optional
  }
}

search_package_docs

Search within package documentation

{
  "name": "search_package_docs",
  "arguments": {
    "package": "requests",    // required: package name
    "query": "authentication", // required: search query
    "language": "python",     // required: "go", "python", or "npm"
    "fuzzy": true            // optional: enable fuzzy matching (default: true)
  }
}

lookup_npm_doc

Fetches NPM package documentation from both public and private registries. Automatically uses the appropriate registry based on your .npmrc configuration.

{
  "name": "lookup_npm_doc",
  "arguments": {
    "package": "axios",      // required - supports both scoped (@org/pkg) and unscoped packages
    "version": "1.6.0"       // optional
  }
}

The tool reads your ~/.npmrc file to determine the correct registry for each package:

• Uses scoped registry configurations (e.g., @mycompany:registry=...)
• Supports private registries (GitHub Packages, GitLab, Nexus, Artifactory, etc.)
• Falls back to the default npm registry if no custom registry is configured

Example .npmrc configurations:

registry=https://nexus.mycompany.com/repository/npm-group/
@mycompany:registry=https://nexus.mycompany.com/repository/npm-private/
@mycompany-ct:registry=https://npm.pkg.github.com/

Example Usage in an LLM

Looking up Documentation

// Looking up documentation
const docResult = await use_mcp_tool({
  server_name: "package-docs",
  tool_name: "lookup_python_doc",
  arguments: {
    package: "requests",
    symbol: "post"
  }
});

// Searching within documentation
const searchResult = await use_mcp_tool({
  server_name: "package-docs",
  tool_name: "search_package_docs",
  arguments: {
    package: "requests",
    query: "authentication headers",
    language: "python",
    fuzzy: true
  }
});

Requirements

• Node.js >= 20
• Go (for Go package documentation)
• Python 3 (for Python package documentation)
• Internet connection (for NPM package documentation)

Development

# Install dependencies
npm i

# Build
npm run build

# Watch mode
npm run watch

Contributing

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

License

This project is licensed under the MIT License - see the LICENSE file for details.