When Is Delegated Play Truthful? Within-Range Regret and the Trilemma of Aligned Delegation

Advertisers delegate bidding to autobidders; users delegate tasks to language-model agents. A person describes what they want to an automated proxy that acts in a mechanism on their behalf. This is the revelation principle in production, and it forces a question classical theory assumes away: when is it optimal to describe yourself honestly to your own proxy? We show the answer turns on one quantity, the proxy's within-range regret. The most a principal can gain by misreporting equals the regret

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ethics.ai (15 July 2026), “When Is Delegated Play Truthful? Within-Range Regret and the Trilemma of Aligned Delegation,” evidence record 11620, https://ethics.ai/record/11620 (originally published by arXiv red teaming query).

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