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  "markdown": "First author, Harness².\n\n## What Ruiyao builds\n\n- [Harness²](https://www.anchorterminal.com/tools/harness2.md), graded E, 42/100, in Agent harnesses. Harness² is Google Research's open-source Python framework that has an editor model rewrite an agent's harness (prompts, guardrails, memory, tools, skills, subagents, scripts and plugins) for each task and keeps lessons for later tasks, with model weights fixed. First author, Harness², researched 2026-10-27.\n\n## Works with\n\n- [Tomas Pfister](https://www.anchorterminal.com/people/tomas-pfister/), Harness² co-author; Head of AI Research, Google Cloud\n\n## Questions\n\n### Who is Ruiyao Xu?\n\nRuiyao Xu is first author at Harness².\n\n### What does Google (Google Research) make?\n\nAnchor Terminal lists Harness² from Google (Google Research). Harness² is Google Research's open-source Python framework that has an editor model rewrite an agent's harness (prompts, guardrails, memory, tools, skills, subagents, scripts and plugins) for each task and keeps lessons for later tasks, with model weights fixed.\n\n### How are Ruiyao's tools graded?\n\nHarness² is graded E, 42 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.\n\n## Sources\n\n- https://harness2.github.io\n- https://github.com/google-research/harness2\n- https://x.com/tomaspfister\n- https://x.com/Google\n\nThese are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.\n",
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