Tag: Harness2

A suminagashi ink marbling photograph with concentric indigo and gold rings echoing a smaller version of the same pattern, representing the two levels of recursion in Harness2

Google Open-Sourced Harness2: Agents That Rewrite Their Own Harness With No Labels

Posted on October 21, 2026October 21, 2026 by Clara Milicent

Google open-sourced Harness2, which rewrites an agent’s prompts, tools and memory on unseen tasks with frozen weights and no labels. What it changes.

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