[Submitted on 14 Oct 2026]
Title:When Correctness Feedback Erases Evidence: Phase-Separated Completeness Auditing in Verus
View a PDF of the paper titled When Correctness Feedback Erases Evidence: Phase-Separated Completeness Auditing in Verus, by Adarsh Agrawal (Independent Researcher)
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Abstract:Correctness feedback suppresses the very evidence that specification-completeness auditing is designed to uncover: programs that satisfy a written contract but violate intended behavior. We demonstrate this objective reversal on 12 Verus/Rust tasks across four model families under matched call budgets. Independent no-feedback discovery more than doubles certified-witness yield relative to IntentShield's corrective-feedback loop (59.0% versus 27.1%). A format-matched iterative control places the larger share of this gap in feedback content, not independent restarts. The advantage holds in every model family and survives parser repair. A separate phase-separated execution matches the aggregate yield without reusing responses; most certified witnesses also fail held-out cases. Preserving these witnesses delivers stronger specification repair: Phase-Revised contracts achieve 81.3% implementation success, versus 62.5% for IS-Revised, with Direct-Revised close behind. Both no-feedback witness sources substantially outperform weakened contracts. The effect does not reproduce in the available Dafny and Lean evaluations, establishing an empirical boundary around the studied Verus/Rust workflow. Completeness auditing and correctness repair have opposing immediate objectives. Preserve and certify the admitted failure before repairing it.
Comments: Paper accepted at the NeurIPS 2026 Workshop on AI for Verifiable Coding
Subjects:
Artificial Intelligence (cs.AI)
Cite as: arXiv:2610.20676 [cs.AI]
(or arXiv:2610.20676v1 [cs.AI] for this version)
https://doi.org/10.48550/arXiv.2610.20676
arXiv-issued DOI via DataCite
Submission history
From: Adarsh Agrawal [view email] [v1] Wed, 14 Oct 2026 14:43:24 UTC (1,388 KB)
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