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Mastering Harness Engineering

Agent = Model + Harness. The model is rented; the harness is what you build. This course teaches you to engineer the part that matters.

Everything that wraps around an AI model to make it dependable in the real world — the agent loop, context, memory, tools, sandboxes, guardrails, evaluation, and economics — is the harness. This guide takes you from first principles through close reading of real shipping harnesses to running production agent programs. Work through it in order; every lesson ends with a quiz whose wrong answers teach as much as the right ones. Your progress is saved locally in your browser.

Content last reviewed September 2026. Examples labelled Illustrative are composites, not reports of specific organizations; everything else is cited — see References.

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