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What is a harness? Everything that is not the model

This story is from 2026-10-21. It is preserved in the archive; the latest stories are on the live feed.

Since the start of the year, everyone talks about the "harness". Harness engineering, agent harness, best harness. Ask around for a definition. You will get five different answers. Yet the definition fits in one sentence. TL;DR : the harness is the software that coordinates exchanges between the mo…

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  1. 2026-10-21 06:03 · DEV Community — AI
    What is a harness? Everything that is not the model

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