{
  "schema": "ULTRACON_AI_EPISTEMIC_UPDATE_V1",
  "id": "UCF-WATCH-2026-09-19-AGENTIC-VALIDITY",
  "date": "2026-09-19",
  "status": "SUBSTANTIVE_MIXED_UPDATE",
  "axes": ["CONFAB", "META", "CONSC", "SPIRAL"],
  "change_type": ["new_peer_reviewed_review", "exceptional_recent_preprint", "construct_validity_guard", "agentic_tool_hallucination"],
  "summary": "A Nature Computational Science review published 18 September formalizes role-specific validity for using LLMs as human proxies, strengthening the separation between behavioral resemblance and human-equivalent mechanism or phenomenology. A 16 September systems preprint adds a distinct agentic failure surface: hallucinated tools and invalid schemas, including MCP namespace collision/shadowing failures, motivating a closed-world resolution gate before downstream action policy.",
  "new_separations": ["behavioral_similarity != human_mechanism_equivalence", "proxy_role_validity != cross_role_validity", "tool_call_plausibility != tool_registry_membership", "valid_tool_resolution != factual_or_policy_correctness"],
  "guardrail": "M1/M2/M3 ↛ M5 remains unchanged. Human-proxy similarity is role- and construct-specific; tool hallucination is an agent-action/interface failure and is not collapsed into ordinary factual hallucination.",
  "source_addendum": "./sources.json",
  "experiment_addendum": "./experiments.json"
}