Mutation-Score the Grader: A Prompt Lockfile for AI C++ Patch Evals
This story is from 2026-09-06. It is preserved in the archive; the latest stories are on the live feed.
A mid-size systems team merged an AI-written patch into a lock-free queue. Unit tests stayed green. Two weeks later a prompt edit asked the model to prefer simpler atomics. The new patch compiled. The golden case still passed, because it never ran two producers. Production dropped items under load.…
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- 2026-09-06 21:02 · DEV Community — AI
Mutation-Score the Grader: A Prompt Lockfile for AI C++ Patch Evals