How LangChain, LangGraph, LangSmith fits together

Automated excerpt

LangGraph exists because real agents don't behave like a straight pipeline. The one-line version an engineer on this stack put well: LangChain for building, LangGraph for orchestrating, LangSmith for observing. If you're prototyping something simple — a single-pass RAG chatbot, a basic summarization tool — LangChain on its own is probably enough.

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