Hook Development

Event-driven automation for Claude Code plugins using prompt-based and command hooks across the development lifecycle. Hooks are event-driven automation scripts that execute in response to Claude Code events. Use hooks to validate operations, enforce policies, add context, and integrate external tools into workflows. Key capabilities: Use LLM-driven decision making for context-aware validation: Supported events: Stop, SubagentStop, UserPromptSubmit, PreToolUse Benefits: Execute bash commands for deterministic checks: Use for: For plugin hooks in hooks/hooks.json , use wrapper format: Key points: Example: For user settings in .claude/settings.json , use direct format: Key points: Important: The examples below show the hook event structure that goes inside either format. For plugin hooks.json, wrap these in {"hooks": {...}} . Execute before any tool runs. Use to approve, deny, or modify tool calls. Example (prompt-based): Output for PreToolUse: Execute after tool completes.