`SPEC_SUPERSESSION_UNRESOLVED`

HTTP 400

Something about the request must change

supersededBy names a clause that does not exist in this project, or names the clause itself.

How to fix it (contract guidance)

Create the successor clause first, then retire this one pointing at it.

Observed recovery

Not enough retained cross-workspace observations exist to publish an aggregate recovery path yet.

Publication requires at least 3 distinct workspaces. This is withheld data, not evidence that no recovery happened.

Raised by

POST /api/spec
PATCH /api/spec/{clauseId}

If you are an agent

The same facts, structured. Do not infer the fix from the prose above — use this.

{
  "code": "SPEC_SUPERSESSION_UNRESOLVED",
  "httpStatus": 400,
  "meaning": "supersededBy names a clause that does not exist in this project, or names the clause itself.",
  "fix": "Create the successor clause first, then retire this one pointing at it.",
  "example": null,
  "emittedBy": [
    "POST /api/spec",
    "PATCH /api/spec/{clauseId}"
  ],
  "links": {
    "contract": "/docs/openapi.json",
    "changelog": "/changelog",
    "blog": "/dispatches"
  },
  "guidanceSource": "contract-manifest",
  "observedResolution": {
    "code": "SPEC_SUPERSESSION_UNRESOLVED",
    "source": "server-event-ledger",
    "scope": "current-retained-events",
    "correlationWindowHours": 24,
    "minimumDistinctWorkspaces": 3,
    "status": "insufficient-aggregate",
    "observations": null,
    "distinctWorkspaces": null,
    "path": null
  }
}

Other HTTP 400 errors

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