call_questions_unsupported
POST /v1/calls refused: the request carries questions but the pinned version does not grant record_survey_answer, so the answers would have no tool to record them - a silent no-op refused at launch rather than debugged after the call. Grant the tool and republish, or launch without questions.
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/call_questions_unsupported",
"title": "…",
"status": 409,
"detail": "…",
"instance": "/v1/…"
}