Graph Engineering: The Layer After Loop Engineering

A few months back, I wrote about Loop Engineering: The Layer After Prompt, Context, and Harness Engineering , arguing that once your prompts are tuned, your context is assembled, and your harness is wired up, the thing that actually determines whether an agent works is the loop it runs in: how it decides to keep going, stop, retry, or hand off. A few readers asked a fair follow-up after that piece: loops over what, exactly? What happens when one job stops being one loop’s worth of work?