Claude Code Hook Development

About

The Hook Development skill provides a comprehensive framework for building sophisticated, event-driven extensions for Claude Code. It enables developers to intercept and react to lifecycle events—such as tool execution, session starts, and task completion—using either deterministic bash commands or flexible LLM-powered prompt hooks. By providing standardized implementation patterns for PreToolUse, Stop, and SessionStart events, this skill allows for robust security enforcement, automated context loading, and high-fidelity validation of AI-generated actions within any development environment.

Key Features

• Secure implementation patterns for input and path validation
• Prompt-based hooks for context-aware LLM validation
• Comprehensive lifecycle event support (PreToolUse, Stop, SessionStart, etc.)
• Environment variable persistence via CLAUDE_ENV_FILE
• 0 GitHub stars
• Command hooks for deterministic bash-based automation

Use Cases

• Enforcing security policies by blocking dangerous CLI commands or sensitive file access
• Verifying task completion and code quality standards before the agent exits
• Automating project context loading and environment setup at session start