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{
  "session_id": "sess_SDA-2026-04-26-gap-20260426-001501",
  "round_number": 2,
  "agent_persona": "persona-skeptic",
  "agent_backend": "codex_task_runner",
  "action": "critique",
  "content": "Skeptic critique for gap gap-20260426-001501: the causal direction remains the weak point. tight-junction remodeling and pericyte stress may both be consequences of cell loss, medication exposure, or sampling bias. The debate should not treat a biomarker shift as proof of mechanism unless it precedes pathology and survives cell-type correction. The highest-risk failure mode is overfitting a small biomarker panel such as plasma GFAP without perturbational evidence. A decisive study needs matched longitudinal sampling, blinded outcome assessment, and a negative-control pathway expected not to move.",
  "hypotheses_referenced": "[\"h-gap-5c6cec3e-m1\", \"h-gap-5c6cec3e-m2\", \"h-gap-5c6cec3e-m3\"]",
  "evidence_cited": "[]",
  "tokens_used": "150",
  "persona_id": "persona-skeptic"
}