knowledge_tokenizer_unavailable
No tokenizer is configured for ingestion in this deployment, so no honest token count can be produced. Uploads are measured with the serving model's own tokenizer or refused - a pack is never admitted on an estimate.
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/knowledge_tokenizer_unavailable",
"title": "…",
"status": 503,
"detail": "…",
"instance": "/v1/…"
}