cargo doc MCP Server

A MCP server for managing Rust documentation through cargo doc commands. This server provides tools to check, build, and search Rust documentation locally.

Features

Tools

get_crate_doc - Get crate's main documentation page for understanding overall concepts and usage
- Parameters:
  - project_path: Path to the Rust project (must be absolute path)
  - crate_name: Name of the crate to get documentation for
list_symbols - List all symbols (structs, enums, traits, etc.) in a crate's documentation
- Parameters:
  - project_path: Path to the Rust project (must be absolute path)
  - crate_name: Name of the crate to list symbols for
search_doc - Search within a crate's documentation
- Parameters:
  - project_path: Path to the Rust project (must be absolute path)
  - crate_name: Name of the crate to search in
  - query: Search query (keyword or symbol)
  - limit (optional): Maximum number of results to return (default: 10)

Related MCP server: McpDocServer

Requirements

Node.js 16 or later
Rust and Cargo installed

Installation

Install dependencies:

pnpm install

Build the server:

pnpm run build

For development with auto-rebuild:

pnpm run watch

Usage

Add the following configuration:

{ "mcpServers": { "docs-rs-mcp": { "command": "/absolute/path/to/docs-rs-mcp/build/index.js" } } }

Debugging

Since MCP servers communicate over stdio, debugging can be challenging. We recommend using the MCP Inspector:

pnpm run inspector

The Inspector will provide a URL to access debugging tools in your browser.

Cache System

The server maintains a cache of built documentation paths to improve performance. Cache entries expire after 24 hours to ensure documentation stays up-to-date.