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Ast Grep

ast-grep/ast-grep-mcp

An experimental Model Context Protocol (MCP) server that provides AI assistants with powerful structural code search capabilities using ast-grep.

View on GitHub15

Install

cargo install ast-grep --locked

Client configuration

{
  "mcpServers": {
    "ast-grep": {
      "command": "uv",
      "args": [
        "--directory",
        "/absolute/path/to/ast-grep-mcp",
        "run",
        "main.py"
      ]
    }
  }
}

Environment variables

AST_GREP_PATH
GitHub stars
15
Author
@ast-grep
Category
Developer Tools, Search Tools
Updated
Oct 6, 2026

About Ast Grep

This MCP server enables AI assistants (like Cursor, Claude Desktop, etc.) to search and analyze codebases using Abstract Syntax Tree (AST) pattern matching rather than simple text-based search. By leveraging ast-grep's structural search capabilities, AI can:

Features

  • Debug why a pattern isn't matching

  • Understand the AST structure of target code

  • Learn ast-grep pattern syntax

  • Validate rules work as expected

  • Iterate on rule development

  • Debug complex matching logic

  • max_results: Limit number of complete matches returned (default: unlimited)

  • output_format: Choose between "text" (default, ~75% fewer tokens) or "json" (full metadata)

  • Find function calls with specific patterns

  • Locate variable declarations

Details on this page are taken from the project's README. Open README

Supported clients

Clients mentioned in this server's README:

View all
Claude Desktop logo

Claude Desktop

Desktop · Freemium · Proprietary

Anthropic's official Claude AI desktop application. Supports MCP servers to extend functionality.

WindowsMacOS
Cursor logo

Cursor

Desktop · Freemium · Proprietary

The first agentic IDE. The Cursor editor truly merges how developers and AI work together, delivering a magical coding experience.

WindowsMacOSLinux

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