Hook Development
Create event-driven automation scripts (hooks) to validate operations, enforce policies, and customize Claude Code workflows.
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Key features
- Validate tool calls, block dangerous commands, and enforce project policies using PreToolUse hooks
- Automate context loading and environment setup with SessionStart hooks
- Define completion standards and verify task success using Stop and SubagentStop hooks
- Implement prompt-based and command-based hooks for event-driven automation
- Utilize portable environment variables like `${CLAUDE_PLUGIN_ROOT}` for creating shareable plugins
Use cases
- Enforcing project-specific coding standards before a file is written.
- Blocking potentially destructive commands, like `rm -rf /`, before execution.
- Automatically loading API keys or project configuration into the environment when a session starts.
FAQ
What does the Hook Development skill do?
This skill enables you to create powerful, event-driven automation scripts (hooks) that customize and control Claude Code's behavior. You can use them to validate operations, enforce project policies, and integrate custom logic directly into your AI development workflow.
Can I create hooks that are easy to share?
Yes. By using portable environment variables like `${CLAUDE_PLUGIN_ROOT}` in your hook commands, you can create self-contained scripts within a plugin, making your custom automations and validation rules easily shareable and reusable across different projects.
How does this skill improve my workflow?
It enhances your workflow by adding layers of safety and automation. Hooks reduce manual oversight, prevent common errors, ensure adherence to project standards, and tailor Claude's environment to your specific needs, making your AI coding sessions more efficient, reliable, and secure.
When should I use this skill?
Use this skill when you need to automatically block dangerous commands, enforce coding standards, load custom project context at the start of a session, or verify that a task is fully complete before Claude finishes. It's ideal for adding safety, consistency, and automation to complex tasks.
What are the main capabilities of Claude Code hooks?
You can create two primary types of hooks: LLM-powered 'prompt' hooks for context-aware decisions and 'command' hooks for executing deterministic shell scripts. These can be triggered by events like `PreToolUse` (before a tool runs), `SessionStart` (to set up an environment), and `Stop` (to validate task completion).
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