hook-developer
Installation
SKILL.md
Hook Developer
Complete reference for developing Claude Code hooks. Use this to write hooks with correct input/output schemas.
When to Use
- Creating a new hook
- Debugging hook input/output format
- Understanding what fields are available
- Setting up hook registration in settings.json
- Learning what hooks can block vs inject context
Quick Reference
| Hook | Fires When | Can Block? | Primary Use |
|---|---|---|---|
| PreToolUse | Before tool executes | YES | Block/modify tool calls |
| PostToolUse | After tool completes | Partial | React to tool results |
| UserPromptSubmit | User sends prompt | YES | Validate/inject context |
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