Diff the Behavior, Not the Code: A Differential Gate for Agent Patches
This story is from 2026-08-28. It is preserved in the archive; the latest stories are on the live feed.
A test suite that passes after an agent patch proves one thing: the patch satisfies the tests you wrote. It says nothing about the behavior users already depend on. The cheapest reliable oracle is differential — run the old code and the new code on the same inputs, compare outputs. This article sho…
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- 2026-08-28 20:44 · DEV Community — AI
Diff the Behavior, Not the Code: A Differential Gate for Agent Patches