[2605.06696] Hidden Coalitions in Multi-Agent AI: A Spectral Diagnostic from Internal Representations
[Submitted on 4 May 2026]
Title:Hidden Coalitions in Multi-Agent AI: A Spectral Diagnostic from Internal Representations
View a PDF of the paper titled Hidden Coalitions in Multi-Agent AI: A Spectral Diagnostic from Internal Representations, by Cameron Berg and 2 other authors
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Abstract:Collections of interacting AI agents can form coalitions, creating emergent group-level organization that is critical for AI safety and alignment. However, observing agent behavior alone is often insufficient to distinguish genuine informational coupling from spurious similarity, as consequential coalitions may form at the level of internal representations before any overt behavioral change is apparent. Here, we introduce a practical method for detecting coalition structure from the internal neural representations of multi-agent systems. The approach constructs a pairwise mutual-information graph from the hidden states of agents and applies spectral partitioning to identify the most salient coalition boundary.
We validate this method in two domains. First, in multi-agent reinforcement learning environments, the method successfully recovers programmed hierarchical and dynamic coalition structures and correctly rejects false positives arising from behavioral coordination without informational coupling. Second, using a large language model, the method identifies coalition structures implied by descriptive prompts, tracks dynamic team reassignments, and reveals a representational hierarchy where explicit labels dominate over conflicting interaction patterns. Across both settings, the recovered partition reveals subgroup organization that a scalar cross-agent mutual-information measure cannot distinguish. The results demonstrate that analyzing hidden-state mutual information through spectral partitioning provides a scalable diagnostic for identifying representational coalitions, offering a valuable tool for monitoring emergent structure in distributed AI systems.
Comments: 18 pages
Subjects:
Artificial Intelligence (cs.AI); Machine Learning (cs.LG); Multiagent Systems (cs.MA)
MSC classes: Primary: 68T42, Secondary: 93A16, 68T07, 94A17, 05C50
Cite as: arXiv:2605.06696 [cs.AI]
(or arXiv:2605.06696v1 [cs.AI] for this version)
https://doi.org/10.48550/arXiv.2605.06696
arXiv-issued DOI via DataCite
Submission history
From: Mark Bailey [view email] [v1] Mon, 4 May 2026 16:59:08 UTC (1,997 KB)
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