ast-grep

ast-grep is a skill for Claude Code, Codex from Dwsy/agent. It costs 34 tokens per session (2,802 once invoked), scanned A, original, no licence file.

A code search, linting, and rewriting tool that understands a program's syntax structure. AST means abstract syntax tree, a structured representation of code.

In plain words
What is it for?
Use it to search code by structure, check code patterns, and perform batch code transformations.
Why use it?
It finds code patterns more precisely than plain text search and supports changing many matching code structures at once.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/dwsy/agent/ast-grep
Any agent
npx skills add Dwsy/agent --skill ast-grep
Clone the repo
git clone --depth 1 https://github.com/Dwsy/agent

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/dwsy/agent/ast-grep.svg)](https://agentmods.dev/skills/dwsy/agent/ast-grep)
Your own site
<a href="https://agentmods.dev/skills/dwsy/agent/ast-grep"><img src="https://agentmods.dev/badge/skills/dwsy/agent/ast-grep.svg" alt="Measured on agentmods" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,802 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00034 $0.02802
Opus 5 $0.00017 $0.01401
Sonnet 5 $0.00007 $0.00560
Haiku 4.5 $0.00003 $0.00280

Measured 3d ago against content hash 552403a1fb60, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 3d ago.

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.

skills/ast-grep/SKILL.md · 493 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 3d ago First seen · 493 lines · 34 tokens per session scan A 552403a1fb60

Subscribe to this mod's changes

ast-grep is a skill published in the GitHub repository Dwsy/agent (22 stars, last pushed 15d ago), with no licence file. It adds 34 tokens to every session and 2,802 once invoked, about $0.0002 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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