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How do you version and roll out prompt changes like code, review, canary, rollback, audit?

Prompts are production code with a worse failure mode: the regression returns 200 OK. The answer interviewers reward treats a one-word prompt edit with the same machinery as a schema migration, with one LLM-specific twist at every stage.

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

Prompts are production code with a worse failure mode: the regression returns 200 OK. The answer interviewers reward treats a one-word prompt edit with the same machinery as a schema migration, with one LLM-specific twist at every stage.

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