{
  "description": "Callback stub scenarios (CONTRACT.md section 8). Each is the sequence of handoff.status messages the stub sends, one per step. A step {'wait_for_details': [fields]} sends 'negotiating' with needs = the missing fields and waits until handoff.update supplies them; it is skipped when the handoff.request already carried them. After handoff.cancel the stub sends 'cancelled' next. 'silent' never answers.",
  "default": "completed",
  "scenarios": {
    "completed": [
      {
        "status": "scheduled",
        "at": "2026-10-20T10:00:00Z"
      },
      {
        "status": "running"
      },
      {
        "status": "completed"
      }
    ],
    "negotiate": [
      {
        "wait_for_details": [
          "phone",
          "time"
        ]
      },
      {
        "status": "scheduled",
        "at": "2026-10-20T10:00:00Z"
      },
      {
        "status": "running"
      },
      {
        "status": "completed"
      }
    ],
    "no-answer-retry": [
      {
        "status": "scheduled",
        "at": "2026-10-20T10:00:00Z"
      },
      {
        "status": "attempted",
        "outcome": "no-answer"
      },
      {
        "status": "scheduled",
        "at": "2026-10-20T14:00:00Z"
      },
      {
        "status": "running"
      },
      {
        "status": "completed"
      }
    ],
    "no-answer-fail": [
      {
        "status": "scheduled",
        "at": "2026-10-20T10:00:00Z"
      },
      {
        "status": "attempted",
        "outcome": "no-answer"
      },
      {
        "status": "scheduled",
        "at": "2026-10-20T14:00:00Z"
      },
      {
        "status": "attempted",
        "outcome": "no-answer"
      },
      {
        "status": "failed",
        "detail": "two attempts, no answer"
      }
    ],
    "call-failed": [
      {
        "status": "scheduled",
        "at": "2026-10-20T10:00:00Z"
      },
      {
        "status": "running"
      },
      {
        "status": "failed",
        "detail": "line dropped"
      }
    ],
    "expired": [
      {
        "status": "scheduled",
        "at": "2026-10-20T10:00:00Z"
      },
      {
        "status": "expired",
        "detail": "slot passed"
      }
    ],
    "unavailable": [
      {
        "status": "refused",
        "reason": "mode-unavailable"
      }
    ],
    "declined": [
      {
        "status": "refused",
        "reason": "declined"
      }
    ],
    "out-of-hours": [
      {
        "status": "refused",
        "reason": "out-of-hours"
      }
    ],
    "silent": []
  }
}