Hook Development

Tool use approval and security enforcement for Claude Code plugins are automated by implementing custom event-driven hooks. These hooks validate tool use, block dangerous commands, and prevent path traversal to protect project integrity without manual intervention.

Prompt hooks in Claude Code are flexible LLM-based hooks for context-aware validation, whereas command hooks are fast deterministic scripts for performance-critical checks. Both hook types automate actions across PreToolUse, PostToolUse, Stop, and SessionStart events.

To block write attempts to specific files like .env credentials, you create a PreToolUse hook using the Hook Development skill. This hook intercepts tool use events and automatically denies destructive bash operations or write commands targeting sensitive paths.

Yes, jq is a required dependency for validating plugin hook configurations and parsing event data. It processes JSON inputs from Claude Code events, enabling deterministic command hooks to execute fast, performance-critical security checks.

Testing and debugging event-driven hooks for Claude Code workflows involves validating hook configuration, checking prompt and command hook execution, and ensuring security policies function correctly across all events including SessionStart and UserPromptSubmit.

Command hooks for workflow automation in Claude Code are limited to fast deterministic checks and cannot perform context-aware validation like prompt-based LLM hooks. They require jq for JSON parsing and are best suited for performance-critical policy enforcement rather than complex reasoning.