arXiv AI By Hongye Yang, Zhihao Xie, Shengjun Xiong

PartHackBench: Certified Equal-Progress Stress Tests for Partial-Credit Tool-Agent Evaluation

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PartHackBench is a new methodology for evaluating partial-credit tool agents that eliminates confounding factors by using a private certifier to ensure that compared trajectories match in both current-state predicate satisfaction and standardized agent attribution. The approach measures score inflation only after certification, and in experiments on 18 held-out tasks it produced matched adversaries for 15 tasks, revealing mean inflation of 0.252 and detecting no strict rollbacks. The study shows that semantic LLM judges are vulnerable to evaluator-targeted attacks, whereas PB-CSTE current-state controls guarantee zero inflation by construction.

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