Crate Indexer

What it does

Crate Indexer connects AI assistants to the Rust ecosystem by providing deep access to crates.io. It allows an AI to fetch specific Rust crates, index their source code, and perform both regex and semantic searches across the codebase to understand implementation details, traits, and API structures.

Tools

• fetch_crate: Download and index a crate from crates.io.
• search_crate: Regex search through crate source code.
• semantic_search: Natural language search for code (requires embeddings).
• list_functions: List or search function definitions.
• list_structs: List or search struct definitions.
• list_enums: List or search enum definitions.
• list_traits: List or search trait definitions.
• list_impls: List or search impl blocks.
• show_item: Get detailed info and source code for an item by ID.
• read_file: Read files from indexed crates.
• read_readme: Get the README of a crate.

Installation

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "crate-indexer": {
      "command": "crate-indexer",
      "args": ["mcp"]
    }
  }
}

Supported hosts

• Claude Desktop