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What Is an Agent Harness? Harness Engineering Explained

This story is from 2026-09-14. It is preserved in the archive; the latest stories are on the live feed.

An agent harness is everything around the model that gives it grounding in reality: the tools it can call, the context it sees, the guardrails that stop it, the loop that drives it, and the checks that verify what it claims. I once told GPT-3.5 Turbo to upvote the top story on Hacker News. It lande…

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  1. 2026-09-14 11:01 · DEV Community — AI
    What Is an Agent Harness? Harness Engineering Explained

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