Distilled from the Learn Harness Engineering course by WalkingLabs, which synthesizes harness engineering theory and practice from OpenAI, Anthropic, and industry practitioners. The model is smart. The harness makes it reliable. — A well-harnessed agent spent \$200/6hrs and built a working game.
Without a harness, same model spent \$9/20min and produced garbage. The model didn't change. The harne