hook-development SKILL.md skillA

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hook-development from anthropics/claude-plugins-official is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add anthropics/claude-plugins-official/hook-development@v0.1.0

Pins v0.1.0 in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

anthropics/claude-plugins-official

Path

plugins/plugin-dev/skills/hook-development/SKILL.md

Versions recorded

2

Latest version

v0.1.0, committed Feb 5, 2026

First version recorded

Nov 20, 2025

Size

16,246 bytes

Repository stars

43,118

License

Apache-2.0

This skill should be used when the user asks to "create a hook", "add a PreToolUse/PostToolUse/Stop hook", "validate tool use", "implement prompt-based hooks", "use ${CLAUDE_PLUGIN_ROOT}", "set up event-driven automation", "block dangerous commands", or mentions hook events (PreToolUse, PostToolUse, Stop, SubagentStop, SessionStart, SessionEnd, UserPromptSubmit, PreCompact, Notification). Provides comprehensive guidance for creating and implementing Claude Code plugin hooks with focus on…

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

# Hook Development for Claude Code Plugins

## Overview

Hooks are event-driven automation scripts that execute in response to Claude Code events. Use hooks to validate operations, enforce policies, add context, and integrate external tools into workflows.

**Key capabilities:**
- Validate tool calls before execution (PreToolUse)
- React to tool results (PostToolUse)
- Enforce completion standards (Stop, SubagentStop)
- Load project context (SessionStart)
- Automate workflows across the development lifecycle

## Hook Types

### Prompt-Based Hooks (Recommended)

Use LLM-driven decision making for context-aware validation:

```json
{
  "type": "prompt",
  "prompt": "Evaluate if this tool use is appropriate: $TOOL_INPUT",
  "timeout": 30
}
```

**Supported events:** Stop, SubagentStop, UserPromptSubmit, PreToolUse

**Benefits:**
- Context-aware decisions based on natural language reasoning
- Flexible evaluation logic without bash scripting
- Better edge case handling
- Easier to maintain and extend

### Command Hooks

Execute bash commands for deterministic checks:

```json
{
  "type": "command",
  "command": "bash ${CLAUDE_PLUGIN_ROOT}/scripts/validate.sh",
  "timeout": 60
}
```
…

Read the whole file at its exact version.

How to install

mdr add anthropics/claude-plugins-official/hook-development@sha256:f47e2d42f6360294

[![mdr](https://markdownregistry.com/badge/art_zpr4be24if5k2ezk.svg)](https://markdownregistry.com/a/art_zpr4be24if5k2ezk)

Versions

The registry has recorded 2 versions of this file, between Nov 20, 2025 and Feb 5, 2026, about one every 77 days.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_zpr4be24if5k2ezk
GET https://markdownregistry.com/api/v1/resolve?ref=anthropics/claude-plugins-official/hook-development
GET https://markdownregistry.com/api/v1/blob/f47e2d42f6360294216a859ae0c30b93caafdd2b2e5ffc007489ba4ca447fa5c

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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.

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