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A prompt tweak fixed one case and silently broke ten others. How do you regression-test an LLM app in CI?

Editing a prompt is a code change with no compiler and no unit test by default, so quality regressions ship invisibly. Treating prompts and models as testable artifacts is what separates a toy from a product. Here is the harness.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Editing a prompt is a code change with no compiler and no unit test by default, so quality regressions ship invisibly. Treating prompts and models as testable artifacts is what separates a toy from a product. Here is the harness.

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Next in this trackDesign an ML experiment-tracking and analysis platform.Next in this trackHow do you build an evaluation harness that runs in CI to gate every model change?Next in this trackHow do you put governance around models: approvals, access, model cards, and deprecation?
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