mcp-error-handling-mcp-server-errors-e-g-missing-required-environment-a94564cf

THEN Configure the MCP client to handle server-side logging messages by setting a notification handler for LoggingMessageNotificationSchema. On the server side, use server.sendLoggingMessage to send error details. This allows the client to display or log server errors for debugging.

// Server-side
server.sendLoggingMessage({ level: "error", data: "Missing required environment variable" });

// Client-side
client.setNotificationHandler(LoggingMessageNotificationSchema, (notification) => {
  console.error(notification);
});