Why SSE for AI agents keeps breaking at 2am

Why SSE for AI agents keeps breaking at 2am Every team building AI agent UIs writes their own SSE client. And every team hits the same four bugs. I know because we shipped 36 agent tools at Praxiom before we sat down and wrote a real protocol instead of patching the same streaming code for the fifteenth time. This is a post-mortem on the four bugs. At the end I'll show you what we extracted. The setup You're building a chat-style UI backed by an LLM agent. The agent calls tools, thinks for a few