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Chris Develder

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#artificial intelligence Preprint May 2026

Agent Collectives Should Not Detect Their Own Imposters: A Chess Case Study

It is found that merely warning the agents of potential imposter presence is not beneficial: it degrades decisions when no imposter is present, provokes reactions ranging from self-accusation to scapegoating, inflates token use, and reveals to the imposter how it was uncovered.

A. Mercier, Chris Develder, Thomas Demeester · 1 citation
Book Open access Sep 2026

Surface Matching in Skill Recommenders: Incomplete Evaluation Hides Simplicity Bias

Two training-time mitigations, label augmentation and shortcut-targeted hard negatives, which reduce judged nonsense while preserving ranking performance are studied.

W. Veys, Matthias De Lange, Jens-Joris Decorte et al. · 0 citations

Hidden State Poisoning Attacks against Mamba-based Language Models

This paper studies the phenomenon whereby specific short input phrases induce a partial amnesia effect in state space models, by irreversibly overwriting information in their hidden states, referred to as a Hidden State Poisoning Attack (HiSPA).

A. Mercier, Chris Develder, Thomas Demeester · 3 citations

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