vocapablebooking_outside_bookable_hours
POST /v1/calendar/events named a time the tenant's bookable-hours policy does not admit - outside its open weekday windows, inside its minimum lead time, or past its booking horizon. Enforced at booking and not only at check_calendar, because book_meeting takes an arbitrary start_time rather than a slot id and a caller can name a time the agent never offered. detail names the rule that refused.
Problem shape
Every non-2xx response is an RFC 9457 application/problem+json body. The type URI below is stable and machine-matchable, so branch on the final path segment (the code) and treat the status as redundant confirmation. See the error-handling guide.
{
"type": "https://docs.vocapable.com/errors/booking_outside_bookable_hours",
"title": "…",
"status": 409,
"detail": "…",
"instance": "/v1/…"
}