Version Control Your Prompts — Prompt Drift Is Real

If a prompt runs more than once, it belongs in version control. Build a golden test set (representative inputs + expected outputs) and run it on every prompt change, treating it as regression testing for instructions. This discipline is now standard in production AI systems but still overlooked by most teams building internal tools.

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Sources: Fungies.io – Prompt Engineering Best Practices 2026 · Thomas Wiegold Blog