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docs: Add more clarification about the LangSmith API key for LangGraph Platform deployments (#5635)

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Andrew Nguonly
2025-07-23 11:39:39 -07:00
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docs/docs/concepts/langgraph_control_plane.md
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@@ -119,6 +119,11 @@ These metrics are displayed as charts in the Control Plane UI.
### LangSmith Integration
A [LangSmith](https://docs.smith.langchain.com/) tracing project is automatically created for each deployment. The tracing project has the same name as the deployment. When creating a deployment, the `LANGCHAIN_TRACING` and `LANGSMITH_API_KEY`/`LANGCHAIN_API_KEY` environment variables do not need to be specified; they are set automatically by the control plane.
A [LangSmith](https://docs.smith.langchain.com/) tracing project and LangSmith API key are automatically created for each deployment. The deployment uses the API key to automatically send traces to LangSmith.
When a deployment is deleted, the traces and the tracing project are not deleted.
- The tracing project has the same name as the deployment.
- The API key has the description `LangGraph Platform: <deployment_name>`.
- The API key is never revealed and cannot be deleted manually.
- When creating a deployment, the `LANGCHAIN_TRACING` and `LANGSMITH_API_KEY`/`LANGCHAIN_API_KEY` environment variables do not need to be specified; they are set automatically by the control plane.
When a deployment is deleted, the traces and the tracing project are not deleted. However, the API will be deleted when the deployment is deleted.