Claude Code Hook Development

About

This skill provides comprehensive guidance for implementing event-driven hooks within Claude Code plugins. It enables developers to integrate both prompt-based reasoning and deterministic bash commands into the agent's lifecycle, covering critical events like PreToolUse, PostToolUse, and SessionStart. By leveraging these patterns, users can enforce safety protocols, automate project context loading, and ensure rigorous task completion standards through a structured, portable approach using environment variables and JSON configurations.

Key Features

• Command hooks for high-performance deterministic bash script execution
• Prompt-based validation for context-aware reasoning and natural language logic
• Environment variable persistence via $CLAUDE_ENV_FILE for session management
• Support for the full hook lifecycle including PreToolUse, Stop, and SessionStart
• 1 GitHub stars
• Portable path handling using the ${CLAUDE_PLUGIN_ROOT} variable

Use Cases

• Automating project-specific context loading and environment setup at session start
• Implementing security guardrails to block dangerous bash commands or unauthorized file access
• Enforcing code quality standards by validating tool outputs before final submission