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Ecdysis: Efficient and Effective Training of Runtime Harnesses for LLM Agents

Research LLM Agents

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TL;DR - Ecdysis trains self-evolving runtime harnesses for LLM agents by aggregating failures across tasks and prioritizing systematic harness defects over model-specific errors. It reportedly improves harness training speed by up to 1.84Ă— while increasing reasoning accuracy by 18.56%.

  • Replaces repeated per-instance search with batch-level, cross-instance failure analysis.
  • Separates model-specific deficiencies from recurring problems that warrant harness-level repair.
  • Uses Failure-Driven Collaborative Refinement with multiple diagnostic roles to refine modification specifications iteratively.
  • Aims to reduce training overhead and avoid overfitting harnesses to individual tasks or failure patterns.

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Ecdysis: Efficient and Effective Training of Runtime Harnesses for LLM Agents

arXiv cs.SE Ruiqing Yue, Yu Cui, Zhuoyu Sun, Sicheng Pan, Xianhong Xue, Tingyu Li, Ting Li, Wenzhuo Zhu, Yi Chen, Yifei Liu, Baohan Huang, Zhe Cui, Haibin Zhang, Cong Zuo 2026-09-10 arXiv:2609.11677
Public signals Hugging Face upvotes 0
Providers: Hugging Face · Upvotes 0 OpenAlex · N/A Publisher · N/A Semantic Scholar · N/A X · N/A Fetched 2026-09-25 14:20:33.772119 UTC

TL;DR - Ecdysis trains self-evolving runtime harnesses for LLM agents by aggregating failures across tasks and prioritizing systematic harness defects over model-specific errors. It reportedly improves harness training speed by up to 1.84Ă— while increasing reasoning accuracy by 18.56%.

  • Replaces repeated per-instance search with batch-level, cross-instance failure analysis.
  • Separates model-specific deficiencies from recurring problems that warrant harness-level repair.
  • Uses Failure-Driven Collaborative Refinement with multiple diagnostic roles to refine modification specifications iteratively.
  • Aims to reduce training overhead and avoid overfitting harnesses to individual tasks or failure patterns.
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