The 4 pillars of a production-grade AI agent (from a doctor who taught himself to code)

No prerequisites. If you've used Claude or ChatGPT and you're wondering what separates a one-off script from an agent that actually runs in production, this post is for you. I wrote my first Python agent in April 2026. It did two things: read a PDF, send a Telegram message. It worked. Once. The second time, the PDF was poorly scanned. The agent crashed. No trace. No notification. The patient never got their appointment. That's the day I understood: an agent that works in demo is not an agent...