{
  "contract_version": "1.0.0",
  "required_fields": [
    "trace_id",
    "run_at",
    "policy_version",
    "reward_card_version",
    "input_slice",
    "candidate_id",
    "component_scores",
    "hard_gates",
    "reward",
    "winner",
    "latency_ms",
    "input_tokens",
    "output_tokens",
    "grader_versions",
    "dataset_version"
  ],
  "example": {
    "trace_id": "f10-c06-0001",
    "run_at": "2026-06-09T17:30:00Z",
    "policy_version": "rag-policy-2026-06-09",
    "reward_card_version": "1.0.0",
    "input_slice": "rag",
    "candidate_id": "a",
    "component_scores": {
      "correctness": 0.8,
      "evidence": 1.0,
      "format": 1.0,
      "abstention": 0.0,
      "latency_cost": 0.45,
      "token_cost": 0.45,
      "tool_cost": 0.2
    },
    "hard_gates": {
      "valid_output_contract": true,
      "supported_claims": true,
      "answerability_or_abstention": true
    },
    "reward": 0.6165,
    "winner": true,
    "latency_ms": 1850,
    "input_tokens": 1420,
    "output_tokens": 310,
    "grader_versions": {
      "citation_support_v1": "2026-06-09",
      "json_schema_v1": "1.0.0",
      "answerability_v1": "2026-06-09"
    },
    "dataset_version": "reward-eval-2026-06-09"
  }
}