Fix MCP protocol compliance: use notifications/initialized method

Fixes protocol compliance issue where clients sending notifications/initialized would get No handler for notification errors

Author: aatchison

pkg/mcp/server.go

@@ -193,8 +193,8 @@ func (s *Server) registerDefaultHandlers() {
 	if s.GetHandler("initialize") == nil {
 		s.RegisterHandler("initialize", s.handleInitialize)
 	}
-	if s.GetNotificationHandler("initialized") == nil {
-		s.RegisterNotificationHandler("initialized", s.handleInitialized)
+	if s.GetNotificationHandler("notifications/initialized") == nil {
+		s.RegisterNotificationHandler("notifications/initialized", s.handleInitialized)
 	}
 	if s.GetHandler("tools/list") == nil {
 		s.RegisterHandler("tools/list", s.handleToolsList)

pkg/mcp/server_test.go

@@ -142,7 +142,7 @@ func TestServerStart(t *testing.T) {
 		t.Error("Initialize handler not registered")
 	}
 
-	if _, exists := server.notifications["initialized"]; !exists {
+	if _, exists := server.notifications["notifications/initialized"]; !exists {
 		t.Error("Initialized notification handler not registered")
 	}
 }