The Anatomy of an Agent Harness
· 9 min read
Most engineers building AI agents spend 80% of their time thinking about which model to use and 20% thinking about everything else. That ratio should be flipped. The model is almost interchangeable at this point — the harness is what determines whether your agent actually works in production.
The equation is simple: Agent = Model + Harness. If you're not the model, you're the harness. And the harness is where nearly all the real engineering lives.
