crush-hooks

crush-hooks is a skill for Claude Code, Codex from charmbracelet/crush. It costs 50 tokens per session (1,842 once invoked), scanned C, original, no licence file.

A skill for Crush, a coding agent, that controls what happens before and after tool calls. It can check, approve, block, rewrite, or add context to tool activity.

In plain words
What is it for?
Adding or changing Crush hooks, such as requiring approval before a tool runs, changing its input, or adding information to its result.
Why use it?
It helps enforce rules around tool use and makes hook problems easier to investigate. The input does not specify any particular rules it provides.

Skill for Claude CodeCodex

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

Good fit Adding or changing Crush hooks, such as requiring approval before a tool runs, changing its input, or adding information to its result.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/charmbracelet/crush/crush-hooks
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 charmbracelet/crush --skill crush-hooks
Clone the repo
git clone --depth 1 https://github.com/charmbracelet/crush

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 crush-hooks

README.md
[![agentmods](https://agentmods.dev/badge/skills/charmbracelet/crush/crush-hooks/github.svg)](https://agentmods.dev/skills/charmbracelet/crush/crush-hooks)
Your own site
<a href="https://agentmods.dev/skills/charmbracelet/crush/crush-hooks"><img src="https://agentmods.dev/badge/skills/charmbracelet/crush/crush-hooks/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 crush-hooks

Your own site · 80×15
<a href="https://agentmods.dev/skills/charmbracelet/crush/crush-hooks"><img src="https://agentmods.dev/badge/skills/charmbracelet/crush/crush-hooks.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,842 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. 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 $0.00050 $0.01842
Opus 5.5 $0.00020 $0.00737
Sonnet 5.5 $0.00010 $0.00368
Haiku 4.5 $0.00005 $0.00184

Measured 1mo ago against content hash a37fe6557b5f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

crush-hooks scanned grade C with 1 finding 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 1mo 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

"tool_input": {"command": "rm -rf /"}
internal/skills/builtin/crush-hooks/SKILL.md · 210 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

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. 1mo ago First seen · 210 lines · 50 tokens per session scan C a37fe6557b5f

Subscribe to this mod's changes

crush-hooks is a skill published in the GitHub repository charmbracelet/crush (28,801 stars, last pushed today), with no licence file. It adds 50 tokens to every session and 1,842 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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