What Breaks After Your AI Demo Works

Originally published at What Breaks After Your AI Demo Works . A Short Story of How My AI Demo Worked and Failed A few weeks ago I built a small AI API. Nothing fancy. Just a simple endpoint. response = llm ( prompt ) It worked. Requests came in. The model responded.Everything looked good. Until the second week. The First Question A teammate asked: “Which request generated this output?” I checked the logs. There was nothing useful there. NO request ID. NO trace. NO connection between the prompt and the output. The system worked — but it wasn’t traceable. The Second Question Very quickly another question appeared. “Why did our AI bill jump yesterday?” I had no answer. We were calling models through an API wrapper, but we weren’t recording: Token usage Model pricing Request-level cost We had built an AI system that spent money invisibly. The Third Question Then something more subtle happened. A user reported that an output looked wrong. The model had responded successfully, but the answe