📝 Building a Custom Harness with Pi and Jev An AI agent is a language model that works in a loop. It reads the task, uses a tool such as "read this file" or "delete that file", looks at the result, and keeps going until the job is done. Each time the model asks to use a tool, that request is called a tool call. The code that runs this loop is called the harness. The model decides what it wants to do. The harness runs it and also decides what the model is allowed to do. A good harness makes…