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Ast Grep

Checked
ast-grep·vlatest·backend

Ast Grep efficiently searches within AST (Abstract Syntax Tree) data for specific patterns or code elements, aiding in debugging and analysis.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add ast-grep/agent-skill --skill ast-grep -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

ast-grep

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned ast-grep/agent-skill at f2175aff21.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
f2175aff21
Manifest
ast-grep/skills/ast-grep/SKILL.md
Scanned
2 files, 587 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

The ast-grep skill allows users to search and analyze code using abstract syntax trees (ASTs). It enables powerful, context-aware queries that can locate specific patterns or structures within source code files. This makes it particularly useful for tasks like finding all instances of a certain function call, identifying unused variables, or searching for specific syntactic constructs across large codebases.

When to use it

  • You need to find all occurrences of a particular JavaScript function in a project.
  • You want to identify and refactor outdated syntax patterns in a codebase.
  • You're debugging an issue that spans multiple files and requires precise code pattern matching.

Key capabilities

  • Search for code patterns using AST-based queries.
  • Analyze and traverse source code structures efficiently.
  • Support for multiple programming languages via compatible parsers.

Example prompts

  • "Find all instances of console.log in the JavaScript files."
  • "Show me every use of the map function in this React component."
  • "List all unused variables in the Python script."

Tips & gotchas

  • Ensure your code is properly parsed before querying; some languages may require additional configuration.
  • AST-based queries can be complex—start with simple patterns and gradually build more advanced searches.