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Harness engineering deep dive

From Programming Digest · subscribed via aiste.ulozaite@gmail.com · original ↗ · unsubscribe

The model is just a small part of a real AI agent system. The harness — the loop, tools, sandbox, state, sensors, and guardrails — is where most of the engineering actually lives. Sensors should transform tool output into clean signals; the agent should never decide it is done on its own; and action spaces shrink through tool design, not longer instructions. The outer harness is the durable asset that compounds over time, while models get swapped and commoditized.

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