Treat prompts as code: version, test, and CI-gate them with PromptFoo

Lakera·medium signal

Production teams in 2026 are versioning prompts, defining test cases, and running them against multiple models to catch regressions before deploy — using PromptFoo, an open-source prompt-testing framework that compares outputs across models and asserts on results. This turns prompt edits from blind tweaking into measurable, reviewable diffs. The skill: add a PromptFoo eval suite to CI so every prompt change runs against fixed cases and fails the build on regression, exactly like unit tests.