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Regression-testing an agent whose output is never the same twice

This story is from 2026-09-06. It is preserved in the archive; the latest stories are on the live feed.

You change one line of a prompt and have no idea what you broke, because diff is useless on free text. The fix is to stop comparing text: freeze a set of real traces, assert on behaviour — which tools got called, which constraints held, what the agent refused to do — and run that suite on every pro…

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  1. 2026-09-06 07:11 · DEV Community — AI
    Regression-testing an agent whose output is never the same twice

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