Where Rules End and Judges Begin: Measuring the Judgment Boundary in Multi-Agent Systems Security

Excerpt

arXiv:2610.07657v1 Announce Type: cross Abstract: LLM-based multi-agent systems (MAS) engage tools, share memory, and delegate tasks, often encountering adversarial content. Current defenses for MAS are typically evaluated in isolation, focusing on one attack type at a time, which can lead to costly and hard-to-audit outcomes. This study organizes defenses into five principles, implementing them as DEFER1 (DEterministic-First Enforcement with Residual judgment), which includes a cascade of 28 ch