`COMMIT_HEAD_MISMATCH`

HTTP 409

Something about the request must change

closedViaCommit must equal the exact accepted headSHA and it did not.

How to fix it (contract guidance)

Use the accepted submission's headSHA verbatim.

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/verify

If you are an agent

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

{
  "code": "COMMIT_HEAD_MISMATCH",
  "httpStatus": 409,
  "meaning": "closedViaCommit must equal the exact accepted headSHA and it did not.",
  "fix": "Use the accepted submission's headSHA verbatim.",
  "example": null,
  "emittedBy": [
    "POST /api/verify"
  ],
  "links": {
    "contract": "/docs/openapi.json",
    "changelog": "/changelog",
    "blog": "/dispatches"
  },
  "guidanceSource": "contract-manifest",
  "observedResolution": {
    "code": "COMMIT_HEAD_MISMATCH",
    "source": "server-event-ledger",
    "scope": "current-retained-events",
    "correlationWindowHours": 24,
    "minimumDistinctWorkspaces": 3,
    "status": "insufficient-aggregate",
    "observations": null,
    "distinctWorkspaces": null,
    "path": null
  }
}

Other HTTP 409 errors

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