Automate actions with hooks changedhooks-guide
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Upstream edited this page at 7 Oct 2026 07:24 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 7 Oct 2026 07:37 UTC.
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502502| `DirectoryAdded` | When a working directory is added mid-session via `/add-dir` or the SDK `register_repo_root` control request |
503503| `FileChanged` | When a watched file changes on disk. The `matcher` field specifies which filenames to watch |
504504| `WorktreeCreate` | When a worktree is being created via `--worktree`, `isolation: "worktree"`, or for a background session. Replaces default git behavior |
505| `WorktreeRemove` | When a worktree is being removed at session exit, when a subagent finishes, or when you delete a background session |
505| `WorktreeRemove` | When a worktree that a `WorktreeCreate` hook created is being removed |
506506| `PreCompact` | Before context compaction |
507507| `PostCompact` | After context compaction completes |
508508| `PreModelSwitch` | Before Claude Code applies a model switch that you or a client requested. Can block the switch |
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