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Zhenpeng Chen

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#artificial intelligence Preprint Sep 2026

Mubric: Mutation Testing-Guided Rubric Generation for LLM Evaluation

Rubric-based evaluation is widely used to assess LLM-based systems by decomposing response quality into task-specific scoring criteria. However, automatically generating rubrics that reliably capture task-specific quality requirements remains challenging. We introduce Mubric, a mutation testing-guided approach to rubri...

Jiayuxuan Yang, Jie M. Zhang, Yiling Lou et al. · 0 citations
Preprint Jul 2026

An Empirical Study of Downstream Adaptation for Agent Skills

A reuse paradox is revealed: although skills are intended to be easily imported and reused, developers spend a lot of effort rewriting what the skills do, fixing skill discoverability, and translating them for different tools and languages, indicating a need for better abstractions, standardized interfaces, and automat...

Xinjian Wu, Jingzhi Gong, Gunel Jahangirova et al. · 0 citations
Jul 2026

Tool Specifications Matter: Uncovering and Mitigating Safety Risks in AI Agents

This paper proposes SafeKeep, an inference-time safeguard that decouples safety judgment from tool execution: it assesses requests using flattened textual tool specifications while retaining the original schema-formatted specifications for execution.

Minghui Pan, Jiayuxuan Yang, Yuan-Yuan Yuan et al. · 0 citations

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