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langchain_blog · Oct 19, 2026 · news

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How Numan Built an Eval-First AI Health Coach with LangGraph and LangSmith

the LangChain blogOct 19, 2026
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In brief

How Numan built Nu, an AI health coach, on LangGraph and LangSmith with per-category evals, simulated conversations, and safety gates on a regulatory line.

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How Numan Built an Eval-First AI Health Coach with LangGraph and LangSmith

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