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Most AI agents fail not because the model is wrong, but because the infrastructure around it is missing. This is a beginner-to-expert guide on what an agent harness is, how it works, and why it is the most overlooked layer in AI systems.

A solid harness makes your agent reliable at launch. A self-improving system keeps it reliable over time. This is the engineering discipline that separates production AI from drifting AI — failure mining, eval generation, regression gating, and the feedback loop architecture that ties it all together.