Add per-event Google Meet links to the calendar tools

[pedrolivaresanchez]

Why

google_calendar_create_event never sent conferenceData, so Google was never asked for a room and would not volunteer one. Since September 2020 the Calendar API only attaches a conference when the caller explicitly requests it — the user- and admin-level "automatically add video calls" settings do not apply to API-created events.

That left callers who need a join link with one option: reuse a standing Meet room across every event. Google warns against exactly this:

Reusing Google Meet conference data across different events can cause access issues and expose meeting details to unintended users. To help ensure meeting privacy, always generate a unique conference for each event by using the createRequest field.

It is also a practical problem: two meetings that overlap collide in the same room.

What

Both google_calendar_create_event and google_calendar_update_event take a new add_google_meet: bool (default False, so existing callers are unaffected).

When set, the request carries a conferenceData.createRequest with a fresh UUID requestId plus the conferenceDataVersion=1 query parameter. Both are required and easy to get wrong independently — Google silently drops the conference if either is missing, and a reused requestId returns the conference it already made rather than a new one, which is how every event ends up sharing a room.

Conferences are created asynchronously, so events.insert can answer pending with no hangoutLink yet. _await_conference re-reads the event up to three times (0.5s, 1s, 2s) until the link lands, and stops immediately on success or failure so a calendar that cannot host Meet does not cost 3.5s.

update_event uses PATCH, so an ordinary reschedule with add_google_meet=False leaves an existing conference untouched.

Tests

python/tests/tools/test_google_calendar.py, 7 cases with httpx mocked: request ids are unique per call, the opt-in parameter and body travel together, the pending path polls and the failure path does not, and a plain update sends no conference data.

7 passed in 0.70s