Streaming Events from LangGraph to the UI (ANSWERED)
**Stream modes** graph.stream() / astream_events yield incremental updates — node enter/exit, partial state, LLM tokens. Pick mode matching product needs: chat UI wants messages; ops dashboard wants updates.
TL;DR — Quick Answer
Use LangGraph stream modes (values, updates, messages, custom) over async iterators; map events to SSE/WebSocket; separate token streaming from state updates; include node metadata for progress UI.
The Interview Question
How do you stream LangGraph execution events (tokens, node starts, tool calls) to a web client?
Deep Explanation
Stream modes graph.stream() / astream_events yield incremental updates — node enter/exit, partial state, LLM tokens. Pick mode matching product needs: chat UI wants messages; ops dashboard wants updates.
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LangGraphStreamingSSEUXLangChainStartups