{
  "agent_id": "agt_01HZ5W3K7Q2R8B7Y8Q3M4N6P9R",
  "activity_type_id": "atyp_shift",
  "start_time": "2026-06-01T09:00:00Z",
  "end_time": "2026-06-01T17:00:00Z",
  "queue_ids": ["q_billing_chat", "q_billing_email"],
  "site_id": "ste_london",
  "notes": "Coverage for product launch surge",
  "external_id": "shift-2026-06-01-jlee"
}