Which languages does this skill support?

It supports over 40 languages, including Python, JavaScript, TypeScript, Go, Rust, Java, C++, Ruby, and Swift.

How is AST-Grep different from standard Grep?

Unlike text-based Grep, AST-Grep understands code syntax and structure, allowing it to find nested patterns and ignore matches inside comments or strings.

Can I use this for automated code migrations?

Yes, the skill is specifically designed for complex refactoring and codemods using structural rewrite patterns and YAML-based rule definitions.

Does it help with security auditing?

Absolutely. It includes patterns for detecting vulnerabilities like SQL injection, XSS, and improper error handling by analyzing the logic flow of the AST.

Is it faster than manual code exploration?

Yes, by providing structural understanding, it typically reduces false positives by 50-80% compared to text search, making exploration much more efficient.

AST-Grep Structural Code Analysis

Name: AST-Grep Structural Code Analysis
Author: modu-ai

bymodu-ai

•

Security & Testing

Performs high-performance structural code search, security scanning, and automated refactoring across 40+ programming languages using AST-Grep.

This skill integrates AST-Grep (sg) into Claude Code to provide syntax-aware code manipulation that far surpasses traditional regex-based tools. By understanding the Abstract Syntax Tree (AST), it enables Claude to perform complex structural searches, identify security vulnerabilities like SQL injection, and execute large-scale refactoring with high precision. It is particularly effective for codebase exploration, API migrations, and enforcing architectural patterns across polyglot environments while minimizing false positives.

Key Features

01Deep integration with Claude's Explore agent for codebase analysis

02YAML-based rule configuration for custom linting and style enforcement

03Automated code transformation and large-scale codemod operations

0420 GitHub stars

05Security vulnerability scanning for over 40 programming languages

06Syntax-aware structural code search using pattern matching

Use Cases

01Migrating deprecated API calls and library patterns across massive repositories

02Identifying and fixing security risks like XSS and unparameterized SQL queries

03Finding complex nested code structures that regular expressions cannot capture

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add modu-ai/moai-rank moai-tool-ast-grep

For use in Claude.ai and ChatGPT

Download Skill