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arXiv · 2608.18490

Bayesian Partner Modelling enables Adaptive Replanning for LLM Coordination

Harsh Goel·Aditya Sai Ellendula·Vaishnav Tadiparthi·Ehsan Moradi Pari·Hossein Nourkhiz Mahjoub·Sandeep P. Chinchali
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Abstract

Multi-agent Large Language Model (LLM) systems often struggle to collaborate with new teammates whose strategies shift mid-task. Because agents execute multi-step or temporally extended skills, they frequently continue executing outdated plans long after public evidence shows that a partner has changed its skill. Existing methods either treat partner tracking as passive context-leaving the agent aware of the shift but slow to act-or replan indiscriminately. We introduce BayesBeliefAgent, which pairs a hierarchical LLM planner with a Bayesian tracking module. Rather than replanning constantly, our agent interrupts its current skill only when a partner's actions directly contradict the inferred skill. Beyond standard reward, we evaluate performance using replanning efficiency and the belief-action gap: the fraction of total decisions where an agent with a correct partner estimate executes a non-complementary skill. Across benchmark Overcooked environments, contradiction-conditioned control drastically narrows this belief-action gap while requiring an order of magnitude fewer replans than heuristic methods

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Harsh Goel, Aditya Sai Ellendula, Vaishnav Tadiparthi, Ehsan Moradi Pari, Hossein Nourkhiz Mahjoub, Sandeep P. Chinchali. 2026-08-19. Bayesian Partner Modelling enables Adaptive Replanning for LLM Coordination. https://arxiv.org/abs/2608.18490

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