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Juntao Tan

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#natural language process... Preprint Oct 2026

CoTrace: Data Recipes for Training Terminal Agents with Harness-Model Co-Evolution

Terminal-agent capability depends jointly on model weights and the runtime harness that formats prompts, binds tools, and handles error recovery. Existing harness-model co-evolution approaches improve both components, yet often treat trajectories produced during harness search as an undifferentiated replay buffer. This...

Ji-Xuan Chen, Jia-Xin Zhang, Qinyuan Ye et al. · 0 citations

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

Opera is presented, a verbal critic framework that treats each correction as a persistent note, followed until the diagnosed problem is resolved, and achieves the highest mean resolve rate among competitive critic baselines on all three benchmarks.

Kai Mei, Zhi-Yuan Hu, Yu-Tong Dai 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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