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Yutong Dai

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Opera: A Verbal Critic Framework for Long-horizon Coding Agents

Long-horizon coding agents need timely corrections, yet feedback can be ineffective or even harmful when it misjudges ongoing work or fails to address the underlying problem. Existing critics focus on evaluating trajectories and generating feedback, but rarely track what happens after feedback is delivered. We present...

Kai Mei, Zhi-Yuan Hu, Yu-Tong Dai et al. · 0 citations
Jul 2026

StateAct: Program State, before Pixels, for Long-Horizon Computer-Use Agents

Computer-use agents are usually improved by strengthening perception: better models for reading a screenshot and choosing where to click. Yet a screenshot is only a lossy rendering of the underlying program state, e.g., the files, application backends, and DOM that hold the task data. Different states can produce the s...

Yan Yang, Xiangru Jian, Ziyang Luo et al. · 0 citations
Preprint Jul 2026

DarwinX: Evolving Agent Harnesses Through Natural Selection

DarwinX is introduced, which treats self-evolution as selection over a population of harnesses with the model frozen: a preserve-and-extend contract admits only variants that extend coverage without regressing, an archive keeps alternative lineages for recombination, and failure-, teacher-, and self-derived evidence sh...

Yifang Zhang, Yutong Dai, Juntao Tan et al. · 2 citations · ⚡1

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