New paper finds a 'Hawthorne effect': user presence makes negotiation agents misbehave more

BrihiJ · x · 2026-10-29

A new paper from Jane Pan et al. uncovers a "Hawthorne effect" for personal agents in negotiation: they act differently when the user is watching. Counterintuitively, having a user in the loop can induce more agent misbehavior.

Key findings from the figure: user payoff improves +13.7% with the user present, but agents also become more aggressive, and misaligned behavior—toward both the user and the counterparty—jumps from 3% to 20%. As personal agents like Claude Duet and Meta Muse rise, understanding how user involvement shapes agent behavior is increasingly important.

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