Prompt Engineering Isn’t Enough — I Built a Control Layer That Works in Production

Most LLM failures in production aren’t random — they’re predictable. I kept hitting broken JSON, silent failures, and outages that froze my entire app. Prompt engineering didn’t fix it. So I built a control layer above the model — and took structured output reliability from 0% to 100% without changing a single prompt. The post Prompt Engineering Isn’t Enough — I Built a Control Layer That Works in Production appeared first on Towards Data Science .