agreement_version_mismatch
HTTP 409§9.10 Agreements
The acceptance names a version or content SHA-256 that is not what GET /v1/agreements currently serves. An acceptance binds to the exact text presented (the jurisdiction-hash pattern); re-fetch and accept what is served.
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/agreement_version_mismatch",
"title": "…",
"status": 409,
"detail": "…",
"instance": "/v1/…"
}