langgraph/docs/docs/how-tos/enable-tracing.md

Enable tracing for your application

To enable tracing for your application, set the following environment variables:

export LANGSMITH_TRACING=true
export LANGSMITH_API_KEY=<your-api-key>

For more information, see Trace with LangGraph.

Learn more

• Graph runs in LangSmith
• LangSmith Observability quickstart
• Tracing conceptual guide