rs-docsrs-mcp

A Model Context Protocol (MCP) server for docs.rs - enabling AI assistants to search and fetch Rust crate documentation.

Features

• 🔍 Search Crates: Search for Rust crates on docs.rs by name or keyword
• 📦 Crate Information: Get detailed information about specific crates
• 📚 Documentation Access: Fetch documentation for specific modules, structs, functions, and more
• 📑 Module Listing: List all modules, structs, enums, functions, traits, and macros in a crate
• 📖 README Access: Retrieve crate README and metadata

Installation

Install globally via npm:

npm install -g rs-docsrs-mcp

Or use with npx:

npx rs-docsrs-mcp

Usage with Claude Desktop

Add to your Claude Desktop configuration file:

MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json

Windows: %APPDATA%\Claude\claude_desktop_config.json

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

If installed globally:

{
  "mcpServers": {
    "docsrs": {
      "command": "rs-docsrs-mcp"
    }
  }
}

Available Tools

1. docs_rs_search

Search for crates on docs.rs.

Parameters:

• query (string, required): Crate name or keyword to search
• limit (number, optional): Maximum number of results (1-50, default: 10)

Example:

{
  "query": "tokio",
  "limit": 5
}

2. docs_rs_crate_home

Get homepage information for a specific crate.

Parameters:

• crate (string, required): Crate name

Example:

{
  "crate": "tokio"
}

3. docs_rs_get_doc

Get documentation for a specific path in a crate.

Parameters:

• crate (string, required): Crate name
• version (string, optional): Version (default: "latest")
• path (string, optional): Documentation path (e.g., "tokio/runtime/index.html")

Examples:

{
  "crate": "tokio",
  "version": "latest",
  "path": "tokio/runtime/struct.Runtime.html"
}

{
  "crate": "serde",
  "path": "serde/trait.Serialize.html"
}

4. docs_rs_list_modules

List all modules and items in a crate.

Parameters:

• crate (string, required): Crate name
• version (string, optional): Version (default: "latest")

Example:

{
  "crate": "tokio",
  "version": "1.35.0"
}

Returns:

• modules: List of modules with descriptions
• structs: List of structs
• enums: List of enums
• functions: List of functions
• traits: List of traits
• macros: List of macros

5. docs_rs_get_readme

Get README and metadata for a crate.

Parameters:

• crate (string, required): Crate name
• version (string, optional): Version (default: "latest")

Example:

{
  "crate": "tokio"
}

Example Queries

Once configured, you can ask Claude:

• "Search for HTTP client crates"
• "Show me the tokio runtime documentation"
• "List all modules in the serde crate"
• "Get the README for actix-web"
• "What structs are available in tokio?"

Development

Clone the repository:

git clone https://github.com/lazhenyi/rs-docsrs-mcp.git
cd rs-docsrs-mcp
npm install

Run locally:

npm start

Requirements

• Node.js >= 18.0.0

How It Works

This MCP server scrapes documentation from docs.rs to provide structured information about Rust crates. It uses:

• cheerio: For HTML parsing
• node-fetch: For HTTP requests
• @modelcontextprotocol/sdk: For MCP protocol implementation
• zod: For parameter validation

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

MIT License - see the LICENSE file for details.

Links

• GitHub Repository
• npm Package
• Model Context Protocol
• docs.rs

Support

If you encounter any issues or have questions, please open an issue on GitHub.