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What is 'harness engineering' for AI agents, and why does the scaffolding matter as much as the model?

The same model performs wildly differently depending on the harness around it. The signal is knowing that the scaffolding often decides agent quality more than the base model. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

The same model performs wildly differently depending on the harness around it. The signal is knowing that the scaffolding often decides agent quality more than the base model. Here is the answer.

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Next in this trackHow do you build a computer-use agent (one that controls a screen/browser), safely and reliably?Next in this trackHow do you optimize a RAG or agent system for cost and latency in production?Next in this trackHow do you implement guardrails for an autonomous agent to prevent harmful or irreversible actions?
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