Harness
A raw model is a brain in a jar. It can think. But on its own, it cannot open Slack, send an email on your behalf, or even know when to quit. A harness is the software around the model that lets it do those things. It gives the model access to tools and information, manages permissions, and controls when it should retry, stop, or ask you for help. A simple way to describe it is: Agent = Model + Harness For…