calendar_free_busy
Is the user free? Busy blocks between start and end (e.g. '2026-10-05T09:00' to '2026-10-05T17:00', user's timezone unless an offset is given) across all their connected calendars, overlapping events merged. Free-marked and declined events don't count. Returns free (true when nothing overlaps), busy [{start, end, titles}] in UTC.
Parameters
- start (string, required)
- end (string, required)
- account (string)