Most “streaming” agent UIs are built around token streams.
That works — until you try to build a real UI.
In this video, Christian Bromann shows how to stream typed agent messages from a LangChain agent into a React UI, without parsing text or guessing what the model is doing.
We’ll set up a LangGraph server, stream messages in real time, and render type-safe agent output directly in the UI — the same pattern used for reliable tool-calling UIs.
This is the foundation pattern for building trustworthy LangChain agent UIs.
📚 Documentation: https://docs.langchain.com/oss/javasc...
🧑💻 Example Application: https://github.com/langchain-ai/langg...