We don't publish
your competitive advantage.

IFMCP client cannot receive or display server-side error messages when a server fails (e.g., due to missing required environment variables).

THENRegister a notification handler for the LoggingMessageNotification schema on the client side using client.setNotificationHandler(). On the server, send error details using server.sendLoggingMessage(). This allows the client to log or display server errors, improving debuggability.

IFWhen initializing an MCP session via streamablehttp_client, the server responds with an unexpected content type (e.g., text/html) and the client only prints a warning without raising an exception.

THENModify the client code to raise a custom exception (e.g., UnexpectedContentTypeError) when the response Content-Type is not the expected MCP JSON stream. As a temporary workaround, make a preliminary HEAD or GET request to the endpoint to check the Content-Type before session initialization, and explicitly raise an error if it is not compatible. Alternatively, wrap the entire session initialization in a try-except block that can catch the printed warning by redirecting stderr, though this is fragile; prefer the definitive fix of patching the SDK.

IFWhen initializing an MCP session via streamablehttp_client, the server responds with an unexpected content type (e.g., HTML error page) instead of the expected MCP JSON stream.

THENManually validate the content type of the server response before creating the ClientSession. Wrap the streamablehttp_client call in a function that checks the response headers and raises a meaningful exception if the content type is not 'application/json' or similar. Alternatively, use a custom read stream that raises an error on unexpected content.