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Switching agent harnesses may be noise: a 447-task study

This story is from 2026-10-26. It is preserved in the archive; the latest stories are on the live feed.

Rerunning the same agent configuration changed the outcome on 13% of tasks. Swapping the harness — the system prompt, tool set, and context management wrapped around the model — changed the outcome on 13% of tasks too. That is the central result of "What Does a Harness Buy? Tokens, Mostly," a prepr…

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  1. 2026-10-26 22:26 · DEV Community — AI
    Switching agent harnesses may be noise: a 447-task study

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