[
  {
    "id": "invoice-01",
    "group": "Extraction",
    "passed": true,
    "latency_ms": 900,
    "cost_microusd": 2000
  },
  {
    "id": "invoice-02",
    "group": "Extraction",
    "passed": false,
    "latency_ms": 1800,
    "cost_microusd": 4000
  },
  {
    "id": "lookup-01",
    "group": "Tool use",
    "passed": true,
    "latency_ms": 1200,
    "cost_microusd": 3000
  },
  {
    "id": "lookup-02",
    "group": "Tool use",
    "passed": false,
    "latency_ms": 3000,
    "cost_microusd": 5000
  }
]