hook-development
Explains writing hooks for PreToolUse, PostToolUse, Stop and other events, including prompt-based hooks.
- Kind
- Skill
- Works with
- Claude Code
- Source
- anthropics/claude-plugins-official @ 58267944f921
- Path
- plugins/plugin-dev/skills/hook-development/SKILL.md
- License
- Apache-2.0
- Jobs
- Guardrails, Automation
InstallInstall it from a plugin marketplace.
/plugin install plugin-dev@claude-plugins-official
# 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
}
```
…