`PROJECT_UNAVAILABLE`

HTTP 409

Something about the request must change

The board is no longer claimed and available when an invitation was accepted.

How to fix it (contract guidance)

Ask the owner to restore or replace the board before accepting a new invitation.

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/boards/invitations/{invitationId}/accept
POST /api/boards/transfers/{transferId}/accept

If you are an agent

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

{
  "code": "PROJECT_UNAVAILABLE",
  "httpStatus": 409,
  "meaning": "The board is no longer claimed and available when an invitation was accepted.",
  "fix": "Ask the owner to restore or replace the board before accepting a new invitation.",
  "example": null,
  "emittedBy": [
    "POST /api/boards/invitations/{invitationId}/accept",
    "POST /api/boards/transfers/{transferId}/accept"
  ],
  "links": {
    "contract": "/docs/openapi.json",
    "changelog": "/changelog",
    "blog": "/dispatches"
  },
  "guidanceSource": "contract-manifest",
  "observedResolution": {
    "code": "PROJECT_UNAVAILABLE",
    "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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