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Task-CoEvolve: Efficient Harness Optimization via Adaptive Validation Task Selection

Research LLM Agents

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TL;DR - Task-CoEvolve reduces the cost of optimizing LLM agent harnesses by adaptively evaluating the validation tasks that best distinguish candidate harnesses. It matches full-validation-set search performance while using 80% fewer evaluations.

  • Samples tasks using outcome variance, emphasizing examples near the agent’s evolving capability frontier.
  • Estimates full-set performance from partial evaluations by correcting for each task’s sampling probability.
  • Enables consistent candidate comparisons even when different validation subsets are used across iterations.
  • Outperforms fixed-subset baselines on online text classification and Terminal-Bench 2.1.

Sources (1)

Task-CoEvolve: Efficient Harness Optimization via Adaptive Validation Task Selection

arXiv cs.CL Atsuyuki Miyai, Kiyoharu Aizawa, Toshihiko Yamasaki 2026-08-20 arXiv:2608.20169
Public signals Hugging Face upvotes 11
Providers: Hugging Face · Upvotes 11 OpenAlex · N/A Publisher · N/A Semantic Scholar · N/A X · N/A Fetched 2026-09-22 14:33:19.017906 UTC

TL;DR - Task-CoEvolve reduces the cost of optimizing LLM agent harnesses by adaptively evaluating the validation tasks that best distinguish candidate harnesses. It matches full-validation-set search performance while using 80% fewer evaluations.

  • Samples tasks using outcome variance, emphasizing examples near the agent’s evolving capability frontier.
  • Estimates full-set performance from partial evaluations by correcting for each task’s sampling probability.
  • Enables consistent candidate comparisons even when different validation subsets are used across iterations.
  • Outperforms fixed-subset baselines on online text classification and Terminal-Bench 2.1.
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