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ast-grep

ast-grep is a skill for Claude Code, Codex from code-yeongyu/oh-my-openagent. It costs 61 tokens per session (3,254 once invoked), scanned A, original, no licence file.

A code search and rewriting tool that understands program structure across 25 programming languages, rather than matching text alone.

In plain words
What is it for?
Use it for structural searches and repeatable code migrations, such as changing console.log to logger.info, converting require to import, or finding missing await statements.
Why use it?
It finds and changes specific functions, calls, imports, and other code patterns while reducing accidental matches in unrelated text.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

not rated 69krepo +145 changed 2d ago A scan SkillSpector: pass 61 tokens custom licence

Good fit Use it for structural searches and repeatable code migrations, such as changing console.log to logger.info, converting require to import, or finding missing await statements.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/code-yeongyu/oh-my-openagent/ast-grep
View source ↗ code-yeongyu/oh-my-openagent omo.dev
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add code-yeongyu/oh-my-openagent --skill ast-grep
Clone the repo
git clone --depth 1 https://github.com/code-yeongyu/oh-my-openagent

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for ast-grep

README.md
[![agentmods](https://agentmods.dev/badge/skills/code-yeongyu/oh-my-openagent/ast-grep.svg)](https://agentmods.dev/skills/code-yeongyu/oh-my-openagent/ast-grep)
Your own site
<a href="https://agentmods.dev/skills/code-yeongyu/oh-my-openagent/ast-grep"><img src="https://agentmods.dev/badge/skills/code-yeongyu/oh-my-openagent/ast-grep.svg" alt="Measured on agentmods" height="20"></a>
Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,254 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00061 $0.03254
Opus 5 $0.00030 $0.01627
Sonnet 5 $0.00012 $0.00651
Haiku 4.5 $0.00006 $0.00325

Measured 2d ago against content hash 3ed9e11e7979, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

ast-grep scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

The scan reads SKILL.md. This mod also ships 5 executable files (install.ps1, install.sh, scripts/ast_grep_helper.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

packages/shared-skills/skills/ast-grep/SKILL.md · 273 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

17 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago Changed · -49 tokens per session 3ed9e11e7979
  2. 8d ago First seen · 273 lines · 110 tokens per session scan A c5512fb49494

Subscribe to this mod's changes

ast-grep is a skill published in the GitHub repository code-yeongyu/oh-my-openagent (68,774 stars, last pushed today), with no licence file. It adds 61 tokens to every session and 3,254 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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