cursor-rust-tools

Overview

Cursor Rust Tools is a specialized MCP server that bridges AI assistants with Rust development tools by exposing LSP functionality through the Model Context Protocol. It enables AI agents to access real-time type information, documentation, and cargo commands by running a dedicated Rust Analyzer instance and parsing cargo documentation locally. The server provides tools for getting documentation for crates or specific symbols, hover information, references, implementations, and cargo command outputs. The implementation is written in Rust and includes a UI for configuration and project management. It maintains documentation cache in the project root and can be configured to ignore specific crates to manage resource usage. The server integrates specifically with Cursor editor through a configuration file that enables the MCP server in Agent Mode.

Try asking AI

After installing, here are 6 things you can ask your AI assistant:

• get_crate_docs

  Get the documentation for a crate or for a specific symbol in the crate

  Try:Show me the documentation for tokioTry:Get docs for tokio::spawn
• get_hover_info

  Get the hover information (type, description) for a specific symbol in a file

  Try:What's the type of this function?Try:Show hover information for this variable
• get_references

  Get a list of all the references for a specific symbol in a file

  Try:Find all references to this functionTry:Where is this variable used?
• get_implementation

  Get the implementation of a symbol in a file

  Try:Show me the implementation of this traitTry:Find where this function is implemented
• find_type

  Find a type just by name in a file the project and return the hover information

  Try:Find the Vec type definitionTry:Where is the Result type defined?
• cargo_test

  Get the output of cargo test

  Try:Run the tests and show me the outputTry:Execute cargo test
• cargo_check

  Get the output of cargo check

  Try:Check the code for errorsTry:Run cargo check and show results

Comparable tools

Installation

cargo install --git https://github.com/terhechte/cursor-rust-tools

cursor-rust-tools

cursor-rust-tools --no-ui

[[projects]]
root = "/path/to/your/rust/project"
ignore_crates = []

{
  "mcpServers": {
    "cursor-rust-tools": {
      "command": "cursor-rust-tools",
      "args": []
    }
  }
}

FAQ

Why can't the server use the existing Rust Analyzer from my editor?

Because Rust Analyzer is designed to be used by a single consumer and requires proper document open/close ordering, the server spins up its own instance to avoid conflicts with the editor.

How does documentation caching work?

The server runs 'cargo docs' and parses the HTML documentation into markdown, storing it in a '.docs-cache' folder in the project root for faster access.

Can I use this with editors other than Cursor?

Currently, the server is specifically designed for Cursor integration, though there are plans to create a Zed extension.

On Hacker News

Recent discussion from the developer community.

• Give Cursor access to Rust's type system and tooling▲ 2
  Story by terhechte · 2025-04-08

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