I kept rewriting the same regex passes against LLM output. So I made a library.

<p><em>Written by Stephanie Dover, Software Engineer 10+ YOE, ex GitHub, Twitch, Microsoft. Creator of Klaussy.</em></p> <p><a href="https://www.linkedin.com/in/stephaniedover/"

<p>You've built the demo. It works. The LLM responds, the tools fire, the output looks great.</p> <p>Then you push it to production — and everything breaks.</p> <p>API calls fail

<p>I shipped a structured-output endpoint to production in March. The schema was clean, JSON mode was on, the model was GPT-4.1, the eval suite was green. Three weeks in, the

<p>Last time I hit a guardrail, it did not offer to repair my car.</p> <p>This one will not repair the car either. But it can help repair an answer that<br /> forgot where the car