Harness Engineering 101: The LLM is the brain, the harness is the body
The article explains a framework called harness engineering, which treats a large language model as the decision‑making core while surrounding software components act as the physical structure that executes tasks. By separating the model from the surrounding code, developers can more easily swap, test, and scale each part, improving reliability and allowing the system to interact with external APIs, databases, and user interfaces.