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Why Changing an Agent Harness Breaks Frozen Models

This story is from 2026-10-28. It is preserved in the archive; the latest stories are on the live feed.

Whenever a team releases a new agent harness, the evaluation script looks the same. You take a popular checkpoint, wire it up to the new prompt templates, tool signatures, and system loop, and measure task resolution against an older setup. If the success rate drops, the team concludes the new harn…

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  1. 2026-10-28 16:56 · DEV Community — AI
    Why Changing an Agent Harness Breaks Frozen Models

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