Welcome back to the Harness Engineering series — a 10-part journey from raw language model to production-ready agentic system. Made by builders. For builders.
In Part 7, I closed on a line worth expanding: "I built an agent" vs "I built an agent I can actually operate." The difference between those two sentences is the sixth and final component of the harness. It's called Observability, and without it, everything else you've read in this series is a bet you can't check.
Every previous component in this series does something the agent needs to work. Observability does something the engineer needs — to see what happened, to know when things are going wrong, and to have any hope of making the harness better over time.
What's ahead:
Part 1: The Raw Model Problem
