vocapablecall_handoff_brief_not_found
No AI-to-human handoff with a brief by that id that you may open (owners and managers read any; a representative only their own).
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_handoff_brief_not_found",
"title": "…",
"status": 404,
"detail": "…",
"instance": "/v1/…"
}