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arXiv · 2606.30649

Thinking Out Loud: Real-Time Deception Monitoring in Asymmetric LLM Negotiations

Nolan Coffey·Faithful Odoi·Makenzie Johnson·Nasir U. Eisty
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Abstract

As LLM-based agents are increasingly deployed to negotiate, delegate, or transact on a user's behalf, software pipelines need runtime mechanisms to verify that an agent's stated intentions match its actual behavior. We study whether a lightweight, real-time chain-of-thought (CoT) monitor can detect strategic deception during asymmetric negotiations, using a used-car sales scenario where a seller agent has private knowledge of an undisclosed defect and a buyer agent has only public market data. The monitor, implemented as a third agent, audits the seller's internal reasoning against its messages and alerts the buyer whenever concealment is detected, across multiple buyer-seller model pairings. Our experiments show that this monitor increases the buyer's walk-away rate, but reveal a persistent intelligence gap: lower-capability buyers often cannot translate an alert into an equitable counter-offer and still accept exploitative deals after being warned. Sellers also change their behavior when told they are monitored, though concealment is not eliminated. These results highlight both the promise and limits of lightweight real-time oversight, offering practical guidance for engineers building and validating monitoring infrastructure for agentic systems with conflicting stakeholder incentives.

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Nolan Coffey, Faithful Odoi, Makenzie Johnson, Nasir U. Eisty. 2026-06-13. Thinking Out Loud: Real-Time Deception Monitoring in Asymmetric LLM Negotiations. https://arxiv.org/abs/2606.30649

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