Alerts user when Claude stops (task complete, needs input, etc.)
with context about what completed. Works on Mac (osascript alert),
Linux (notify-send/zenity), and Windows (PowerShell MessageBox).
Follows same optional install pattern as statusline:
- Prompts in interactive mode if existing hook detected
- --force-notify to replace existing
- --no-notify to skip installation
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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