What Is an AI Agent Harness? // TRAIN BRAIN

What Is an AI Agent Harness?

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AI agent harness is the environment that sits between the model and the real world, and it's why tools like Claude Code and Codex can run long, multi-step tasks without falling apart.
We break down what a harness actually does, why the focus is shifting from pure context engineering to harness engineering, and how a simple loop mechanism inside the harness lets an agent plan, act, verify, and reset with fresh context on every pass.
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