Author

Yumo Zhang

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Preprint Aug 2026

What Guides the Agent? Adjudicating Unauthorized Behavior via Localizing Behavior-Guiding Instructions

This work proposes Attnlocate, a runtime framework for fine-grained localization of context spans that genuinely influence tool-calling decisions, i.e., behavior-guiding instructions, and designs a multi-head, multi-layer attention aggregation scheme to construct a token-level feature space tailored for object detectio...

Yi-Chao Gao, Yumo Zhang, Yunhao Yao et al. · 1 citation

Preprint Aug 2026

MAFIA: Query-Only Memory Attacks via Probing and Factual Injection against Audited LLM Agents

This work proposes MAFIA, a query-only Memory Attack framework via probing and Factual Injection against Audit, tailored to this extended threat model, and introduces a placement strategy that ensures retrieval-competitive injection via memory probing, budget allocation, and scheduling.

Jiamin Chen, Yi-Sen Gao, Yan-Ping Li et al. · 0 citations