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Only an approved template can be scheduled. Session text cannot. The time has to be at least 5 minutes from now and within 30 days. A success body with scheduled: true is a schedule, not a delivery.

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What the assistant calls

1

Resolve the clock

If you do not name a timezone, the assistant calls get_api_key and uses timeZone. If you name a zone, it passes an ISO offset, for example 2026-10-25T09:00:00-04:00. A value with Z or an offset is that exact instant.
2

Schedule

send_message uses type: template and scheduledAt. A past time, a time inside the next 5 minutes, or a time past 30 days is rejected. The assistant fixes scheduledAt and retries with a new idempotencyKey.
The template must be APPROVED. The assistant tells you the time it will send. To stop it before it goes out, use Cancel a scheduled message. Rules are on Messages.