EngineerAgent Skills · Sunnyvale, CA, US
Addy Osmani
Engineer at Anthropic (Claude Code); creator of agent-skills
Engineer at Anthropic working on Claude Code, previously an engineering leader on Google Chrome, and an author on developer productivity. He wrote "Agent Harness Engineering" and essays on software factories and the future of the IDE, and maintains an agent skills collection.
Quoted in the State of Harness report
“A decent model with a great harness beats a great model with a bad harness.”
Quoted in State of Harness — October 2026: A harness is everything around the model that makes an agent do work · original
“Verification, not generation, is the real constraint on a factory.”
Quoted in State of Harness — October 2026: The pain points: cost is the loudest everyday pain, and few teams can verify what agents ship · original
Sources
- github.com/addyosmani
- github.com/addyosmani/agent-skills
- addyosmani.com
- addyosmani.com/blog/agent-harness-engineering
- x.com/addyosmani/status/2053231239721885918
- AI Engineer talk: Manish Kapur, Sonar & Addy Osmani, Anthropic
Verified Oct 29, 2026