yep

Shogi.Contracts/Socket/SessionJoinedByPlayerSocketMessage.cs

@@ -1,9 +1,15 @@
 using Shogi.Contracts.Types;
 
-namespace Shogi.Contracts.Socket
+namespace Shogi.Contracts.Socket;
+
+public class SessionJoinedByPlayerSocketMessage : ISocketResponse
 {
-    public class SessionJoinedByPlayerSocketMessage : ISocketResponse
+    public SocketAction Action => SocketAction.SessionJoined;
+
+    public string SessionName { get; }
+
+    public SessionJoinedByPlayerSocketMessage(string sessionName)
     {
-        public SocketAction Action => SocketAction.SessionJoined;
+        SessionName = sessionName;
     }
 }