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Guidance and patterns for creating event-driven hooks (PreToolUse, PostToolUse, Stop, SessionStart, etc.) for Claude Code plugins and projects.
Comprehensive guidance on authoring hooks that run on Claude Code events (PreToolUse, PostToolUse, Stop, SubagentStop, SessionStart, SessionEnd, UserPromptSubmit, PreCompact, Notification).
Covers:
hooks/hooks.json and user .claude/settings.jsonIncludes debugging, testing, lifecycle notes (hooks load at session start), matchers, examples, utility scripts, and security best practices (input validation, path safety, quoting variables). Ideal for plugin authors and integrators implementing automation or safety checks around tool usage.
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