LangSmith Tracing Tutorial: Monitor and Debug Your LLM Calls Step by Step

In this video, we walk through how to trace and monitor your LLM application using LangSmith, a powerful observability tool built by the creators of LangChain. You’ll see how LangSmith captures every LLM call, groups them into traces, and gives you deep visibility into inputs, outputs, latency, token usage, and cost — even for multi-step workflows. You’ll learn how to: Set up LangSmith and generate an API key Configure environment variables to enable tracing Use LangSmith with any LLM framework (not just LangChain) Trace simple single-call LLM interactions Track complex multi-step workf…