{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://ulam.ai/schemas/frontier-math-rl/trajectory-3.0.json",
  "type": "object",
  "additionalProperties": false,
  "required": ["schema_version", "trajectory_id", "episode_id", "problem_id", "policy_version", "grader_version", "steps", "final_submission_ref", "score_report_ref"],
  "properties": {
    "schema_version": {"const": "3.0"},
    "trajectory_id": {"type": "string"},
    "episode_id": {"type": "string"},
    "problem_id": {"type": "string"},
    "policy_version": {"type": "string"},
    "grader_version": {"type": "string"},
    "steps": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["step_id", "event_type", "content_sha256", "tool_name", "tool_input_sha256", "tool_output_sha256", "claim_ids", "milestone_ids", "visibility"],
        "properties": {
          "step_id": {"type": "integer", "minimum": 0},
          "event_type": {"enum": ["assistant_message", "tool_call", "tool_result", "checkpoint", "submission"]},
          "content_sha256": {"type": ["string", "null"], "pattern": "^[a-f0-9]{64}$"},
          "tool_name": {"type": ["string", "null"]},
          "tool_input_sha256": {"type": ["string", "null"], "pattern": "^[a-f0-9]{64}$"},
          "tool_output_sha256": {"type": ["string", "null"], "pattern": "^[a-f0-9]{64}$"},
          "claim_ids": {"type": "array", "items": {"type": "string"}},
          "milestone_ids": {"type": "array", "items": {"type": "string"}},
          "visibility": {"enum": ["policy_visible", "reward_only"]}
        }
      }
    },
    "final_submission_ref": {"type": "string"},
    "score_report_ref": {"type": "string"}
  }
}