What a harness is here In this channel's material, a harness is the structured setup you use to run a model comparison — the fixed set of tasks, prompts, and evaluation steps you apply the same way each time. It's what makes a vibe check repeatable: instead of judging a model from one-off impressions, you run the same harness across models so the results can actually be compared. [^193e20c6-de46-5ac3-8500-7ef4ad80b80b@0]