macOS Calendar

**Quick judgment:** Solid and practical macOS‑only calendar integration that is well‑structured for LLM control, with good handling of dates and validation. Best suited for users who rely on Apple Calendar locally and want automated event creation from natural language instructions. **Strengths and behavior:** - Provides a clear JSON interface for event creation (title, time, duration, alarms, all‑day, recurrence) and enforces passing data via stdin, which is appropriate for privacy. - Uses `offset_days` and `iso_date` to avoid locale issues, making the date logic more robust than naive string parsing. - Enforces safe patterns like listing calendars first, avoiding read‑only calendars, and logging actions. **Key risks / limitations:** - Platform‑limited: only works on macOS with Apple Calendar and AppleScript enabled; automation permissions may be required and can fail silently if misconfigured. - Scope appears focused on listing calendars and creating events; editing or deleting existing events is not clearly supported from the provided documentation. - Recurrence rules rely on correct RRULE construction; complex patterns can be error‑prone if the LLM misinterprets user intent. - Logs include calendar name and event summary, which may contain sensitive information on the local machine. **Recommended scenarios:** - Use when a macOS user explicitly wants events or reminders added to their native Apple Calendar (especially recurring meetings, reminders with alarms, and vacation blocks). - Particularly appropriate in personal productivity or work‑assistant contexts where reliable, local calendar entries are more important than cross‑platform support. - Avoid or fall back to other tools when the user is not on macOS, uses non‑Apple calendar systems exclusively, or needs advanced event management features beyond listing calendars and creating new events.