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This paper introduces Preregistered Belief Revision Contracts (PBRC), a protocol-level mechanism for multi-agent systems (including LLM-based agents) that separates open communication from admissible belief changes by publicly fixing evidence triggers and revision operators. The work addresses dangerous conformity effects in agent deliberation and provides formal guarantees that social-only pressure cannot drive false consensus.
Large-scale study finds LLM-based scientific agents ignore evidence 68% of the time and rarely revise beliefs, showing they execute workflows but lack genuine scientific reasoning.