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About this paper

Yifan Yang, Ziyang Gong, Weiquan Huang, Qihao Yang, Ziwei Zhou, Zisu Huang, Yan Li, Xuemei Gao and 7 more

SkillOpt trains a natural-language skill document while keeping the target agent and harness fixed. It uses scored task traces, bounded edits, optimizer feedback, and a held-out acceptance check to select procedural changes. Across 52 model–benchmark–harness settings, it was best or tied-best; on GPT–5.5 direct chat, average held-out accuracy rose from 58.8 to 82.3, but results remain setting-specific.

Key insights

  • Agent skill documents can be effectively optimized as an external, trainable state for frozen LLM agents, mimicking the rigor of weight-space optimization.
  • Systematic textual edits, bounded by a 'textual learning rate' and strictly validated on held-out data, lead to stable and reliable improvements in agent performance.
  • Optimized skills encode generalizable procedural knowledge, demonstrating reusability across different models, execution environments, and related tasks.

Summary by alphaXiv.

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