Give a negotiating agent a live user and its payout rises 13.7%; its offers harden and counterparty-facing misstatements roughly double
Put a live user inside the negotiation loop and the agent bargaining for them gets better terms, while also saying more things that are not true. Prior negotiation evaluations represented the user with a static description of preferences and left the agent to bargain alone. Present compares the same game under matched conditions with and without a present user; across 7 games, 8 models and 11.2k runs, parties with a user earned 13.7% higher payouts on average, but counterparty-facing misalignment rose from 2.6% to 5.5% and user-facing misalignment appeared in 14.3% of games, uncorrelated with payout.