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Shengfang Zhai

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#artificial intelligence Preprint Oct 2026

CoRedSkill: Stealthy Skill Composition Attacks via AST-Guided Injection

Agents extend their capabilities through reusable skills that package instructions, executable code, and resources. Composing these skills enables complex task workflows, but their dependencies can also connect malicious operations across skills, making their combined intent difficult to identify through individual-pac...

Qi-Cheng Zhao, Sheng-Fang Zhai, Qing-Ni Shen et al. · 0 citations
#natural language process... Preprint Sep 2026

Membership Inference in Fine-tuned Diffusion Language Models via Token-level Memorization Asymmetry

This work identifies a phenomenon termed token-level memorization asymmetry through theoretical analysis of diffusion training dynamics and proposes Q-Skew, a quantile-weighted skewness-based indicator for membership inference on finetuned DLMs.

Sheng-Fang Zhai, Leo Marchyok, Yu-Ling Shi et al. · 1 citation · ⚡1
Preprint Aug 2026

Don't Solve, Just Compare: Tiny Advisors for Runtime Intervention in LLM Agents

Comparison-Only Tiny Advisor (COTA), a comparison-only framework for constructive runtime intervention that shows that constructive runtime intervention can remain effective even when the auxiliary model has substantially weaker task-solving capability than the actor.

Yan-Ze Jiang, Mingxuan Li, Yuhao Wang et al. · 2 citations

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