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How do you build an evaluation harness that runs in CI to gate every model change?

A green build still means nothing for model quality. The signal is an eval harness that runs deterministically in CI, compares against a frozen baseline, and blocks the merge on regressions. Here is how to make it fast, stable, and trusted.

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

A green build still means nothing for model quality. The signal is an eval harness that runs deterministically in CI, compares against a frozen baseline, and blocks the merge on regressions. Here is how to make it fast, stable, and trusted.

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