Agent Hooks
Deterministic shell commands that execute at key lifecycle points during agent sessions. Unlike instructions, hooks run code with guaranteed outcomes for security policies, quality checks, or audit trails. Claude Code's hooks reference lists over 30 events, including PreToolUse, PostToolUse, PermissionRequest, UserPromptSubmit, Stop, SubagentStart, SubagentStop, PreCompact, PostCompact, SessionStart, and SessionEnd (https://code.claude.com/docs/en/hooks).
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