`IDEMPOTENCY_MISMATCH`

HTTP 409

Something about the request must change

This requestId was already used with a different request body.

How to fix it (contract guidance)

Generate a fresh requestId for new work; replay only the identical body.

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/admin/webhooks/{eventId}/replay
POST /api/admin/feedback/{feedbackId}/promote
POST /api/doctrine
POST /api/doctrine/{slug}/agree
POST /api/items/batch
PATCH /api/items/{workId}
POST /api/items/{workId}/state
POST /api/items/{workId}/progress
POST /api/items/{workId}/override
POST /api/items/reorder
POST /api/claim
POST /api/lease
POST /api/submit
POST /api/supersede
POST /api/verify

If you are an agent

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

{
  "code": "IDEMPOTENCY_MISMATCH",
  "httpStatus": 409,
  "meaning": "This requestId was already used with a different request body.",
  "fix": "Generate a fresh requestId for new work; replay only the identical body.",
  "example": null,
  "emittedBy": [
    "POST /api/admin/webhooks/{eventId}/replay",
    "POST /api/admin/feedback/{feedbackId}/promote",
    "POST /api/doctrine",
    "POST /api/doctrine/{slug}/agree",
    "POST /api/items/batch",
    "PATCH /api/items/{workId}",
    "POST /api/items/{workId}/state",
    "POST /api/items/{workId}/progress",
    "POST /api/items/{workId}/override",
    "POST /api/items/reorder",
    "POST /api/claim",
    "POST /api/lease",
    "POST /api/submit",
    "POST /api/supersede",
    "POST /api/verify"
  ],
  "links": {
    "contract": "/docs/openapi.json",
    "changelog": "/changelog",
    "blog": "/dispatches"
  },
  "guidanceSource": "contract-manifest",
  "observedResolution": {
    "code": "IDEMPOTENCY_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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