Tool42 — AI-Assisted Rust Code Analysis
What is Tool42?
Tool42 is an MCP (Model Context Protocol) server that helps AI agents analyze and work with Rust code. It provides tools for Cargo commands, Clippy, reading and analyzing source files, searching codebases, managing dependencies, discovering tests, analyzing project structure, extracting documentation, and refactoring — without the serialization errors that often occur when AI agents use Cargo directly.
The Problem
When AI assistants use Cargo directly for tasks like cargo check or cargo build, they often fail or hang due to output serialization issues. Tool42 wraps these operations in a stable MCP interface so AI agents get reliable, paginated results for code analysis. It also helps with cross-platform workflows — no more PowerShell vs Bash splits when you use Tool42 on any platform.
Core Capabilities
Build & check
- Cargo — run build, check, test and more; paginated output for reliable AI consumption
- Clippy — run lints with pagination so agents get actionable feedback
Analysis
- Read & describe — read files with line limits; extract structure from Rust sources
- Search — text search across the codebase
- Dependencies — extract and inspect project dependencies
- Docs — extract documentation comments from Rust files
Discovery & refactor
- Tests — discover and list all test functions
- Project structure — overview of modules and files
- Refactoring — rename symbols, extract functions, move items, change signatures