Hook Development

You configure Claude Code hooks by defining event triggers like PreToolUse and PostToolUse in hooks/hooks.json, mapping them to specific scripts or prompts, and restarting Claude Code to load the policy-driven configuration for automated workflow control.

Prompt-based hooks inject contextual instructions into the session, while command hooks execute external scripts to validate tool usage or enforce safety policies. Both types are configured in hooks.json to manage event-driven automation across standard events like SessionStart and Stop.

Yes, Claude Code plugin hooks enable safe, automated control by validating tool usage before execution via PreToolUse events. You can implement security best practices and policy-driven validation rules directly in your hook scripts to block unsafe actions.

You can use the included debugging, linting, and testing utilities to ensure hooks are safe, fast, and reliable. The skill provides testing helpers and examples to validate your hook configuration and script behavior before deploying them to production workflows.

Yes, the hook configuration supports parallel execution design for event-driven automation. This allows multiple hook scripts or prompts attached to the same event, such as UserPromptSubmit or Notification, to run concurrently for efficient workflow processing.

Hooks require proper configuration validation in hooks.json and can impact session performance if scripts are slow. You should follow security best practices and use the provided linting aids to prevent misconfigurations that could disrupt Claude Code session events.