Tag: Harness2

A flat vector illustration of a large grey puzzle-piece block wrapped by a thin teal wireframe layer with small warm amber nodes on its corners, representing EnvHarness reshaping AI agent training environments

Google Open Sources EnvHarness: The Layer That Turns Static Agent Benchmarks Into Teachers

Posted on October 28, 2026October 28, 2026 by Clara Milicent

EnvHarness reshapes frozen agent benchmarks for training without touching their verifiers, with gains up to 9.0 points on held-out tasks. How it works.

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.