Calendar

Claude can read your Apple Calendar, create an event, and change one you name. It never deletes an event and cannot send invitations.

Once you switch Calendar on, an assistant can read today, any day, or a range of days across every calendar your Mac shows, and add to them.

Times come back in your Mac’s own time zone, and every timestamp carries an explicit UTC offset, so an assistant cannot quietly guess wrong about which day you meant.

Can

• Read today, one day, or a range of days
• Create an event, with a location and notes if you give them
• Change an event you name: its time, title, calendar, location or notes

Cannot

• Delete an event
• Send or answer invitations
• Change anything you did not ask it to change

Tools

Tool	What it does	Kind
calendar_today	Today’s events. Takes no arguments; “today” resolves in your Mac’s local time zone	Read
calendar_events	Events across whole local days, from through to inclusive	Read
calendar_create_event	Creates an event and returns it as saved, with its id	Write
calendar_update_event	Updates fields of an event by id. Only the fields sent are changed	Write

Try it

What's on my calendar today?
What does my week look like?
Am I free on Friday afternoon?
Add lunch with Priya on Thursday at 1pm.
Move my dentist appointment to 3pm.
Put the school play on the family calendar for the 14th at 7pm.

Worth knowing

Changing an event only changes what you asked for

calendar_update_event applies only the fields it was sent. Everything else on the event is left exactly as it was. To clear a location or the notes, the assistant sends an empty string for that field — there is no way to blank a field by accident.

Recurring events change one occurrence

Updating a recurring event changes only that occurrence, never the whole series. There is no tool that edits a recurrence rule.

Deleting is not available

There is no delete tool for Calendar, so no request produces one. If an assistant says it has deleted an event, it has not — check the Calendar app.

Every calendar your Mac shows

Including subscribed and shared calendars, because EventKit presents them all. Hiding a calendar in the Calendar app does not hide it here.

Permissions

Switching Calendar on asks macOS for access to your calendars (NSCalendarsFullAccessUsageDescription). The prompt names Pomeroy, and nothing is requested until you flip the toggle.

What Pomeroy asks macOS for