{
  "$id": "metrics-record.v1",
  "title": "Metrics record (metrics/phase-<phase>.jsonl, meta.jsonl line)",
  "type": "object",
  "properties": {
    "duration_ms": { "type": ["number", "null"], "minimum": 0 },
    "tokens_in": { "type": ["number", "null"] },
    "tokens_out": { "type": ["number", "null"] },
    "retry_count": { "type": ["number", "null"], "minimum": 0 }
  }
}