PreToolUse | 0 | Runs before tool calls are executed. Can be used to block or modify tool inputs. |
PermissionRequest | 1 | Runs when a permission dialog is shown. Can be used to automatically allow or deny permissions. |
PostToolUse | 2 | Runs after tool calls complete. Can be used to inspect results or provide additional context. |
UserPromptSubmit | 3 | Runs when the user submits a prompt, before Claude processes it. |
Notification | 4 | Runs when Claude Code sends notifications. |
Stop | 5 | Runs when Claude Code finishes responding. |
SubagentStop | 6 | Runs when subagent tasks complete. |
PreCompact | 7 | Runs before a compact operation. |
SessionStart | 8 | Runs when Claude Code starts a new session or resumes one. |
SessionEnd | 9 | Runs when a Claude Code session ends. |
