# Ruiyao Xu (slim)

> Ruiyao Xu is first author at Harness². Harness² on Anchor Terminal, with grades, an about and public profiles.

- Full: https://www.anchorterminal.com/people/ruiyao-xu/index.md (~650 tokens) · this version ~430 tokens · JSON https://www.anchorterminal.com/people/ruiyao-xu/index.json · canonical https://www.anchorterminal.com/people/ruiyao-xu/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-27
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

First author, Harness².

## What Ruiyao builds

- [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.

## Works with

- [Tomas Pfister](https://www.anchorterminal.com/people/tomas-pfister/), Harness² co-author; Head of AI Research, Google Cloud

## Questions

### Who is Ruiyao Xu?

Ruiyao Xu is first author at Harness².

### What does Google (Google Research) make?

Anchor Terminal lists Harness² from Google (Google Research).

### How are Ruiyao's tools graded?

Harness² is graded E, 42 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.

## Sources

- https://harness2.github.io
- https://github.com/google-research/harness2
- https://x.com/tomaspfister
- https://x.com/Google

These 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.