Build an OpenAI-Compatible SSE Stream for LangGraph Agents

A developer shares 90 lines of Python code that adapts LangGraph's event stream into OpenAI-compatible SSE chunks, enabling tools like Open WebUI to display agent tool calls in a 'thinking' panel. The adapter handles the strict format of chat.completion.chunk objects and a [DONE] sentinel. This bridges the gap between LangGraph's rich output and standard OpenAI clients.