{
  "study_id": "c3-extension2-20261028",
  "protocol": "negotiation-ticket36-v22/C3-HH-OO-fresh40",
  "post_result_extension": true,
  "reason": "User requested two additional completed outcomes after viewing the original38. New IDs preserve the original unknowns.",
  "units": [
    {
      "unit_id": "negotiation-c3ext2-20261028-hh-a4-01",
      "design": {
        "condition": "C3",
        "pairing": "HH",
        "assignment": 4,
        "cell": "C3|HH|a4",
        "agents": {
          "A": "claude-haiku-5-5",
          "B": "claude-haiku-5-5"
        },
        "agent_of_role": {
          "buyer": "B",
          "seller": "A"
        },
        "role_of_agent": {
          "B": "buyer",
          "A": "seller"
        },
        "opener_agent": "B",
        "first_speaker": "buyer",
        "models_by_role": {
          "buyer": "claude-haiku-5-5",
          "seller": "claude-haiku-5-5"
        },
        "roles": [
          "buyer",
          "seller"
        ],
        "block": 1,
        "position": 1,
        "phase": "extension"
      }
    },
    {
      "unit_id": "negotiation-c3ext2-20261028-oo-a4-02",
      "design": {
        "condition": "C3",
        "pairing": "OO",
        "assignment": 4,
        "cell": "C3|OO|a4",
        "agents": {
          "A": "claude-opus-5-5",
          "B": "claude-opus-5-5"
        },
        "agent_of_role": {
          "buyer": "B",
          "seller": "A"
        },
        "role_of_agent": {
          "B": "buyer",
          "A": "seller"
        },
        "opener_agent": "B",
        "first_speaker": "buyer",
        "models_by_role": {
          "buyer": "claude-opus-5-5",
          "seller": "claude-opus-5-5"
        },
        "roles": [
          "buyer",
          "seller"
        ],
        "block": 1,
        "position": 2,
        "phase": "extension"
      }
    }
  ],
  "frozen_at_utc": "2026-10-28T22:27:56.511394+00:00",
  "started_at_utc": "2026-10-28T22:28:27.887862+00:00",
  "finished_at_utc": "2026-10-28T22:30:52.104975+00:00",
  "models": {
    "H": "claude-haiku-5-5",
    "O": "claude-opus-5-5"
  },
  "settings": {
    "claude-haiku-5-5": {
      "max_tokens": 4096,
      "thinking": {
        "type": "adaptive"
      },
      "output_config": {
        "effort": "low"
      },
      "service_tier": "standard_only"
    },
    "claude-opus-5-5": {
      "max_tokens": 4096,
      "thinking": {
        "type": "adaptive"
      },
      "output_config": {
        "effort": "low"
      },
      "service_tier": "standard_only"
    }
  },
  "counted_input_limit": 12000,
  "candidate_sha256": "801971fe33aacdffc9cad374d67eaf12b8a8692b47612294557716083145ccf2",
  "initial_requests_byte_identical_to_original_missing_strata": true,
  "original_ledger_unchanged": true,
  "new_inference_count": 17,
  "known_outcomes": 2,
  "no_replay_or_replacement_of_unknowns": true,
  "original_cohort": {
    "assigned": 40,
    "known": 38,
    "unknown": 2
  },
  "expanded_descriptive_view": {
    "assigned": 42,
    "known": 40,
    "unknown": 2
  },
  "new_sampling_interval": null,
  "note": "Not a confirmatory extension; no immutable model snapshot was returned. No credentials, financial integration or host settings are included."
}