{
  "$context": "https://schema.org.ai",
  "$type": "ErrorType",
  "$id": "https://epcis.dev/errors/write-class-refused",
  "slug": "write-class-refused",
  "title": "The write class cannot be asserted",
  "status": 400,
  "retryable": false,
  "costed": false,
  "door": "epcis.dev",
  "doors": [
    "epcis.dev"
  ],
  "summary": "A capture payload named a `spine:writeClass` the caller may not set. The class lattice is MONOTONE DOWNWARD: `simulated` is a self-downgrade and is accepted from anyone, because it can only shrink what an event is admissible for. `witnessed` is the gateway's DEFAULT and is stamped, never accepted — a class a request can claim is not a class, and the day a tenant is pinned simulation-only an accepted assertion would be an escape hatch that had always worked and therefore looked correct. Any other value fails closed.",
  "remediation": "Omit `spine:writeClass` for the normal case — the gateway stamps `witnessed`. Declare `\"simulated\"` when the event is generated rather than observed. A tenant that must never emit witnessed events is pinned at its key, not at its payload.",
  "derivedFrom": [
    "docs/specs/shared-surface.md §2.4",
    "docs/specs/verbs/epcis.dev.md §A5",
    "#195"
  ]
}