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ast-grep-rule-crafter

ast-grep-rule-crafter is a skill for Claude Code, Codex from hylarucoder/skills-for-vibe-coder. It costs 71 tokens per session (1,064 once invoked), scanned A, original, no licence file.

A rule-writing helper for ast-grep, a tool that searches and changes code by understanding its syntax rather than matching plain text. Rules are written in YAML, a human-readable configuration format.

In plain words
What is it for?
Use it to write lint rules, modernize code, migrate APIs, search for syntax patterns, and apply automatic refactoring fixes.
Why use it?
It helps create repeatable code checks and automated changes that can recognize code patterns more accurately than simple text searches.

Skill for Claude CodeCodex

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

not rated 53repo 10mo ago A scan 71 tokens no licence

Good fit Use it to write lint rules, modernize code, migrate APIs, search for syntax patterns, and apply automatic refactoring fixes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/hylarucoder/skills-for-vibe-coder/ast-grep-rule-crafter
View source ↗ hylarucoder/skills-for-vibe-coder
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 hylarucoder/skills-for-vibe-coder --skill ast-grep-rule-crafter
Clone the repo
git clone --depth 1 https://github.com/hylarucoder/skills-for-vibe-coder

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-rule-crafter

README.md
[![agentmods](https://agentmods.dev/badge/skills/hylarucoder/skills-for-vibe-coder/ast-grep-rule-crafter/github.svg)](https://agentmods.dev/skills/hylarucoder/skills-for-vibe-coder/ast-grep-rule-crafter)
Your own site
<a href="https://agentmods.dev/skills/hylarucoder/skills-for-vibe-coder/ast-grep-rule-crafter"><img src="https://agentmods.dev/badge/skills/hylarucoder/skills-for-vibe-coder/ast-grep-rule-crafter/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for ast-grep-rule-crafter

Your own site · 80×15
<a href="https://agentmods.dev/skills/hylarucoder/skills-for-vibe-coder/ast-grep-rule-crafter"><img src="https://agentmods.dev/badge/skills/hylarucoder/skills-for-vibe-coder/ast-grep-rule-crafter.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,064 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.
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 $0.00071 $0.01064
Opus 5.5 $0.00028 $0.00426
Sonnet 5.5 $0.00014 $0.00213
Haiku 4.5 $0.00007 $0.00106

Measured 2mo ago against content hash 285053eed909, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ast-grep-rule-crafter 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 2mo 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-rule-crafter/SKILL.md · 146 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

Files

What ships with it

2 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. 2mo ago First seen · 146 lines · 71 tokens per session scan A 285053eed909

Subscribe to this mod's changes

ast-grep-rule-crafter is a skill published in the GitHub repository hylarucoder/skills-for-vibe-coder (53 stars, last pushed 10mo ago), with no licence file. It adds 71 tokens to every session and 1,064 once invoked, about $0.0003 per session on Opus 5.5. 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.

DebuggingLanguages
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