{
  "nodes": [
    {
      "id": "s1",
      "type": "startCall",
      "position": {"x": 0, "y": 0},
      "data": {"name": "Start A", "prompt": "Greet path A.", "is_start": true}
    },
    {
      "id": "s2",
      "type": "startCall",
      "position": {"x": 0, "y": 200},
      "data": {"name": "Start B", "prompt": "Greet path B.", "is_start": true}
    }
  ],
  "edges": []
}