Hook Development for Claude Code

About

Hook Development enables developers to extend Claude Code's capabilities through sophisticated event-driven automation. This skill provides the architectural blueprints for implementing hooks across the entire session lifecycle, from SessionStart to PostToolUse and Stop events. It covers both high-level LLM-driven prompt hooks for nuanced reasoning and high-performance bash-based command hooks for deterministic validations. By using this skill, developers can enforce security policies, automate context loading, and create custom guardrails that ensure Claude operates safely and efficiently within specific project constraints.

Key Features

• Standardized JSON output formats for permission decisions and system messages
• 0 GitHub stars
• Environment variable management using CLAUDE_PLUGIN_ROOT and CLAUDE_ENV_FILE
• Guidance for both Prompt-Based and Command-Based hook architectures
• Detailed event lifecycle mapping including PreToolUse, Stop, and SessionStart
• Security patterns for path traversal prevention and input validation

Use Cases

• Automating project-specific context loading and environment setup at the start of every session
• Implementing security guardrails to block dangerous shell commands or sensitive file access
• Creating validation layers that ensure tests pass or builds succeed before Claude can complete a task