hook-development

To create Claude Code plugin hooks for event-driven automation, you configure hook formats for specific event types like PreToolUse or SessionStart, utilizing both prompt-based and command-based approaches to trigger scripted or LLM-driven workflows.

Prompt-based hooks leverage LLM-driven logic for dynamic validation, while command-based hooks execute scripted automation. Both hook types process event-driven inputs and outputs but differ in their execution environment and processing flexibility.

You can validate user inputs before tool execution by implementing a PreToolUse hook. This event-driven hook intercepts tool calls, allowing you to apply matchers and execute validation scripts before the tool proceeds.

Yes, you can use the SessionStart hook to load project-specific context when a session begins. This event-driven automation hook executes configured commands or prompts immediately upon session initialization.

Security best practices for Claude Code hooks involve properly managing environment variables and restricting hook permissions. Debugging techniques include analyzing input/output structures and testing matchers to ensure correct event-driven validation triggers.