ResearchResearch paperReasoning & Planning · Agents & Tool Use · Training & Scaling2 sources · Oct 19, 2026

HarnessPro: Recursive Harness Self-Improvement with Pareto Optimization for Performance-Cost Trade-offs

We introduce HarnessPro, a label-free method for evolving harnesses to improve task performance while reducing execution cost.

Key points

  • Harness development plays a crucial role in building capable AI agents.
  • Recent approaches improve harnesses through recursive self-improvement (RSI), but their performance gains often come with higher execution costs.
  • Specialized agents diagnose execution trajectories, plan updates with different performance-cost priorities, and implement them as candidate harnesses.
  • Rather than returning a single harness, HarnessPro uses normalized weighted squared-distance selection to provide cost-focused (lite), balanced (medium), and performance-focused (heavy) harnesses for different deployment budgets.

Sources (2)

Extractive summary: sentences quoted from the sources.

Before this

  1. Oct 18, 2026Compile Once, Run Cheap: Frozen, Portable Skills for Embodied Agents, and What Recursive Self-Improvement Adds
  2. Oct 18, 2026Explore or Confirm? LLM Agents Misallocate Measurements Under Noise
  3. Oct 18, 2026Google Open-Sources Harness2, a Recursive Agent Harnessing Framework
  4. Oct 17, 2026Hippo: Training-Free Agent Self-Evolution via Hippocampal Replay
  5. Oct 17, 2026deepseek-ai/DeepSeek-V4.1-Flash-1017
  6. Oct 16, 2026Welcome Beam: a 501B open model you can own, customize, and scale

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