webhook_target_name_reserved

HTTP 422§9.8 Messaging, calendar, and webhooks

The webhook_id names a platform tool. A target may not shadow the registry (CANON facts 11 and 83); the same refusal the runtime makes at bind time.

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/webhook_target_name_reserved",
  "title": "…",
  "status": 422,
  "detail": "…",
  "instance": "/v1/…"
}

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