TonyBai

Oct 19, 2026 · Artificial Intelligence

Google's Harness²: Agents Self-Improve Their Own Harnesses Without Weight Updates

Google's Harness² introduces a dual-layer recursive self-improvement framework where agents optimize their own harnesses—prompt, tools, memory, skills—via behavioral comparison instead of ground truth, achieving up to 11.5-point gains on benchmarks and enabling weaker models to surpass stronger ones with static harnesses.