Prompts as Code: How to Version, Test, and Ship the Prompt Layer in 2026

Most production AI features are still glueing prompts together with string concatenation in some random Node service. The prompt is the new SQL query and we are all writing it like it is 2003. Here is what treating the prompt layer like real source code looks like in 2026, the workflow that actually catches regressions before users do, and the part that surprised me most when I made the switch.

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