Rust Expert

A Rust MCP (Model Context Protocol) server that gives any MCP-compatible AI assistant live access to the entire rust-lang GitHub organization — source code, compiler errors, RFCs, The Book, The Reference, The Nomicon, Rust By Example, and crates.io.

Built with rmcp 1.5.0 (the official Rust MCP SDK).

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Tools

Tool	Description
search_rust_source	Code search across all rust-lang repos (rustc, std, Cargo, Clippy, rustdoc…)
search_rust_issues	Issues & PRs across any rust-lang repo
get_repo_file	Read any file from any rust-lang repository
list_rust_repos	List all public repos in the rust-lang org
explain_compiler_error	Full E0xxx error explanations sourced directly from rustc
get_rust_book	Chapters from The Rust Programming Language
get_rust_reference	Sections from the Rust Reference (formal language spec)
get_rust_nomicon	Sections from the Rustonomicon (unsafe / advanced Rust)
get_rust_by_example	Chapters from Rust by Example
get_rust_rfc	Full RFC text by number
search_rust_rfcs	Search accepted RFCs by keyword
get_crate_info	Crate metadata from crates.io
get_rust_edition_guide	Edition migration guides (2015 / 2018 / 2021 / 2024)

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Build

Requires Rust (stable, edition 2021).

git clone https://github.com/Degens-World/rust-expert-mcp
cd rust-expert-mcp
cargo build --release
# binary → target/release/rust-expert-mcp  (or .exe on Windows)

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Configure in Claude Code

claude mcp add rust-expert -- /path/to/rust-expert-mcp

Or add it manually to your Claude config (~/.claude/claude.json):

{
  "mcpServers": {
    "rust-expert": {
      "command": "/path/to/rust-expert-mcp"
    }
  }
}

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "rust-expert": {
      "command": "/path/to/rust-expert-mcp"
    }
  }
}

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GitHub Token (recommended)

Without a token the GitHub API allows 10 search requests / minute and 60 requests / hour.
With a token: 30 searches / minute and 5 000 requests / hour.

Generate a token at GitHub → Settings → Developer Settings → Personal Access Tokens (no scopes required for public repos), then pass it via environment variable:

{
  "mcpServers": {
    "rust-expert": {
      "command": "/path/to/rust-expert-mcp",
      "env": {
        "GITHUB_TOKEN": "ghp_your_token_here"
      }
    }
  }
}

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Example usage (with Claude)

Search for how `Pin` is implemented in the standard library.
→ search_rust_source(query="Pin", repo="rust")

Explain compiler error E0505.
→ explain_compiler_error(error_code="E0505")

Show me RFC 2094 (Non-Lexical Lifetimes).
→ get_rust_rfc(number=2094)

What chapter covers async/await in The Book?
→ get_rust_book(chapter="SUMMARY")

Read the trait-objects section of the Reference.
→ get_rust_reference(section="trait-objects")

How many downloads does tokio have?
→ get_crate_info(name="tokio")

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License

MIT