Six tools versus two. Retell AI's Cal.com integration documents six booking tools — check availability, book, list, get, reschedule, cancel. Vapi's Google Calendar integration documents two: create event and check availability, with a timeZone field that "defaults to UTC". Both checked 6 September 2026. That gap decides what happens on a reschedule, a cancellation and a Perth caller.
What this covers
- Create is not reschedule: what the docs actually list
- Time zones, AWST and the 4 October 2026 problem
- Two calls, one slot: what stops a double-booking
- Direct calendar, scheduler, or CRM calendar — three different failure modes
- No slots left, and where the booking lands in the CRM
This is a technical summary. The full guide — with the tables and worked examples — is on our site: *Can an AI Agent Actually Book Into Your Calendar?*.
Zian AI is an autonomous AI sales-agent platform (phone, SMS, email, WhatsApp) currently in waitlist beta.
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