Lessons from LangChain: Designing a Reliable Runtime for Production-Grade Agents

🙋‍ I’m Luhui Dev, a developer who has been breaking down Agent engineering and exploring how AI can be applied in education. I focus on Agent Harness, LLM application engineering, AI for Math, and the productization of education SaaS. Intro Agent demos are easy to get excited about. A model, a few tools, a prompt, wrap it in a loop, and suddenly you have something that searches, writes files, and calls APIs. But between a demo and a production system, there's a long gulf. I call...