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Evals are the new unit tests
Why prompt changes deserve the same rigor as code — and how to set up a golden set in an afternoon.
Tomás Rivera
Vibes don’t scale
Most teams still ship prompt changes by reading a handful of outputs and nodding. That works until the day it silently breaks a workflow for ten thousand users. Evals turn intuition into a number you can track.
A good golden set is small, sharp and representative: fifty to two hundred real inputs, each with a clear definition of a good answer.
Make it part of the pipeline
In BLACKBOX07 every prompt version is scored automatically on pull request. Regressions block the merge, improvements get a changelog entry, and rollbacks are one click.
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