Hook Development

概要

Develop powerful, event-driven automation scripts (hooks) to customize and secure your Claude Code workflows. This skill provides comprehensive guidance for creating hooks that respond to lifecycle events like tool usage, session start, or task completion. Learn to implement both command-based hooks for deterministic checks and advanced, LLM-driven prompt-based hooks for context-aware validation and decision-making. Use hooks to enforce coding standards, block dangerous commands, load project-specific context, and integrate external tools, adding a robust layer of automation and policy enforcement to your development process.

主な機能

• Validate tool calls, block dangerous commands, and enforce project policies using PreToolUse hooks
• 46,246 GitHub stars
• Automate context loading and environment setup with SessionStart hooks
• Define completion standards and verify task success using Stop and SubagentStop hooks
• Implement prompt-based and command-based hooks for event-driven automation
• Utilize portable environment variables like `${CLAUDE_PLUGIN_ROOT}` for creating shareable plugins

ユースケース

• Enforcing project-specific coding standards before a file is written.
• Blocking potentially destructive commands, like `rm -rf /`, before execution.
• Automatically loading API keys or project configuration into the environment when a session starts.