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Yimin Liu

the Ohio State University

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#artificial intelligence Preprint Sep 2026

BenchShield: Formal Model-Backed Instrumentation for Reward Integrity in LLM-Agent Evaluation Infrastructure

BenchShield is presented, a model-backed instrumentation layer for reward integrity in LLM-agent evaluation that grounds detection in a finite lifecycle model of an evaluation's reward-relevant events and achieves 96% accuracy in detecting reward hacking from infrastructure-side evidence.

Sheng-Han Zheng, Zong-Lin Di, Yimin Liu et al. · 0 citations
Preprint Aug 2026

What Keeps Agent Skills from Being Reusable? Evidence from 138K SKILL.md Files

A deterministic routing stress test over 20,000 skills shows the functional impact: skills with valid routing metadata are retrieved more reliably from startup descriptions than skills with routing defects, while AI-marked skills show more safety and portability problems.

Chi Zhang, Yimin Liu, Xinze Chen et al. · 0 citations

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