AI Engineering
Apr 15, 2026 · Artificial Intelligence
Thin Harness, Fat Skills: The Essence of AI Agent Architecture
The article explains how Garry Tan's three AI‑agent engineering principles—Thin Harness, Fat Skills, and Fat Code—replace raw model size arguments with a disciplined architecture that yields 10‑100× productivity gains, illustrated through concrete skill files, case studies, and community insights.
AI agentsarchitecturefat code
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