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What an AI Agent Harness Contains, and Why the Model Layer Stays Swappable

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

TL;DR An agent harness is the loop around the model: it assembles context, calls the model, runs tools, keeps the session and enforces what the agent may touch. OpenAI's own documentation splits the stack three ways, and the split is the useful part: harness, environment, application server. The ha…

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  1. 2026-10-10 19:00 · DEV Community — AI
    What an AI Agent Harness Contains, and Why the Model Layer Stays Swappable

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