crush-hooks SKILL.md skillA
crush-hooks from charmbracelet/crush is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add charmbracelet/crush/crush-hooks@git:20261104.491479aPins git:20261104.491479a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- charmbracelet/crush
- Path
internal/skills/builtin/crush-hooks/SKILL.md- Versions recorded
- 4
- Latest version
- git:20261104.491479a, committed Nov 4, 2026
- First version recorded
- Apr 26, 2026
- Size
- 9,525 bytes
- Repository stars
- 29,003
- License
- a license file GitHub does not identify
Use when the user wants to add, write, debug, or configure a Crush hook — gating or blocking tool calls, approving or rewriting tool input before execution, injecting context into tool results, or troubleshooting hook behavior in crush.json.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Crush Hooks Hooks are user-defined commands in `crush.json` that fire at specific points during execution, giving deterministic control over tool behavior. They run **before** permission checks and **only on the top-level agent's** tool calls — subagent calls (task tool, agentic_fetch, etc.) are not intercepted, though the subagent tool call itself is. For the full reference, see `docs/hooks/README.md`. This skill covers what you need to author correct hooks. ## Supported Events Crush supports 13 hook events: `PreToolUse`, `PostToolUse`, `PostToolUseFailure`, `PermissionRequest`, `PermissionResult`, `SessionStart`, `SessionEnd`, `TurnStart`, `TurnEnd`, `StopFailure`, `Interrupt`, `PreCompact`, `PostCompact`. Event names are case-insensitive and accept snake_case (`PreToolUse`, `pretooluse`, `pre_tool_use` all work); an unknown name is a config error. The five events that carry a tool call (`PreToolUse`, `PostToolUse`, `PostToolUseFailure`, `PermissionRequest`, `PermissionResult`) accept `matcher`; the rest run every configured hook and reject `matcher`. Only `PreToolUse` (allow/deny/halt/rewrite/context), `PostToolUse` …
Read the whole file at its exact version.
How to install
mdr add charmbracelet/crush/crush-hooks@sha256:0c5cc4da567a3bf1The line at the top of this page pins the label git:20261104.491479a, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_7wrm3ejd3bp7ndux)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between Apr 26, 2026 and Nov 4, 2026, about one every 64 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261104.491479a latest | 2026-11-04 | 491479a | 9,525 B | A | view · diff |
| git:20261026.6c3ce0c | 2026-10-26 | 6c3ce0c | 9,528 B | A | view · diff |
| git:20260426.b9fdf72 | 2026-04-26 | b9fdf72 | 7,289 B | A | view · diff |
| git:20260426.dc003bf | 2026-04-26 | dc003bf | 6,818 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9525 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
charmbracelet/crush · 29,003 stars · license a license file GitHub does not identify · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7wrm3ejd3bp7ndux GET https://markdownregistry.com/api/v1/resolve?ref=charmbracelet/crush/crush-hooks GET https://markdownregistry.com/api/v1/blob/0c5cc4da567a3bf1f7640f0b2a3347fa63d7fd07b06fb98e4c8bb68ac5b40b44
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.