Is my data still sent to LangSmith when running LangGraph server locally and setting LANGSMITH_TRACING=false?

[thenhaque]

Hi,
According to this FAQ can-i-use-langgraph-studio-without-logging-to-langsmith, no traces will be sent to LangSmith. I understand that with the below setting, I shouldn’t see my graph in “Tracing Projects” in LangSmith:

Ready!

• API: http://localhost:2024
• LangGraph Studio Web UI: https://smith.langchain.com/studio/?baseUrl=http://127.0.0.1:2024
  LANGSMITH_TRACING=false

However, it is not clear to me if my data (i.e. messages in my graph) would still be sent to LangSmith to render visualization. Some clarification would be greatly appreciated. Thanks.

[dqbd]

Hello! For clarification: The messages in your graph will NOT be sent to the LangSmith backend unless LANGSMITH_TRACING=true. However the LangSmith frontend will still receive the messages to render those, but these will not leave your computer.

[thenhaque]

Hi, thanks @dqbd for your prompt response. Could you help clarifying for me further how my graph message reaches LangSmith frontend without leaving my computer? Thanks again!

[dqbd]

When running langgraph dev / langgraph up, the CLI will spin up the LangGraph Server locally, which the Studio FE is accessing.

[WarrenMfg]

Thank you for helping us understand! Curious (because I will be asked by my security team), how does this work at a high level? In other words, how does a smith.langchain.com access the data locally? And how does the data persist across local server starts? Thanks again!

[thenhaque]

Thanks @WarrenMfg for rephrasing the question much more clearer than mine. Could you clarify, @dqbd ? Thanks.