mediumConceptDesignMidSeniorStaff
How do you ship a change to a production prompt safely?
4 min readUpdated 2026-08-15
Answer
Short answer
Treat the prompt as a versioned artefact under review, run your eval set in CI against a pinned model version, canary on a slice of traffic with the version recorded per request, and keep rollback a config change rather than a deploy.
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Likely follow-ups
- Your eval suite passes but the canary looks worse. Which do you trust, and what do you do next?
- How would you evaluate a prompt change whose whole purpose is to change tone?
- The prompt is edited by a non-engineer in a prompt-management UI. How do you keep the guarantees?
- What would make you decide an eval set has stopped being representative?
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