Numan builds Nu, an AI health coach tested with LangGraph and LangSmith evals
Overview
Numan, a UK digital health company, describes how it built Nu, an AI health coach for patients with long-term conditions such as weight, hormones and sexual health.
Nu is designed to avoid medical diagnosis, prescriptions and clinical decisions. In a first-party LangChain Blog post, Numan says single-turn test fixtures and scripted conversations did not test multi-turn coaching, so it scores each category separately, runs the same graph in production and in tests, and simulates patient conversations. Clinicians sign off on the scoring rubric, and a boundary regression test blocks releases.
Written by AI from the articles below · updated Oct 19, 11:38 AM ET
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- LangChain BlogOfficialPickHow Numan built an eval-first AI health coach with LangGraph and LangSmith
AINuman describes how it built Nu, an AI health coach, to avoid medical diagnosis, prescriptions, and clinical decisions. The team found that single-turn fixtures and scripted conversations failed to test multi-turn coaching, so it scores per-category, runs the same graph in production and tests, and simulates patient conversations. Clinicians sign off the rubric, and a boundary regression blocks releases.
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