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
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

Installing via Smithery

To install Package Docs for Claude Desktop automatically via Smithery:

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

Manual Installation

npx -y mcp-package-docs

Usage

As an MCP Server

Add to your MCP settings configuration:

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

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

{
  "name": "lookup_npm_doc",
  "arguments": {
    "package": "axios",      // required
    "version": "1.6.0"       // optional
  }
}

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

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

License

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