When using Google ADK (google-adk==1.17.0) with SSE streaming over FastAPI, the agent is emitting internal or intermediate messages in the response stream. These messages are marked with partial: true and appear to include internal thinking or non-final agent output, which should not be exposed to the client. The expected behavior is that partial SSE responses should only contain user-safe, externally visible content, and internal reasoning should never be streamed regardless of the partial flag.