diff --git a/src/OpenClaw.Shared/Models.cs b/src/OpenClaw.Shared/Models.cs
index e0dc52fd0..cb3a77cff 100644
--- a/src/OpenClaw.Shared/Models.cs
+++ b/src/OpenClaw.Shared/Models.cs
@@ -98,6 +98,7 @@ public class OpenClawNotification
 {
     public string Title { get; set; } = "";
     public string Message { get; set; } = "";
+    public string? FullMessage { get; set; }
     public string Type { get; set; } = "";
     public bool IsChat { get; set; } = false; // True if from chat response
 
diff --git a/src/OpenClaw.Shared/OpenClawGatewayClient.cs b/src/OpenClaw.Shared/OpenClawGatewayClient.cs
index a5e758a25..5d00b6604 100644
--- a/src/OpenClaw.Shared/OpenClawGatewayClient.cs
+++ b/src/OpenClaw.Shared/OpenClawGatewayClient.cs
@@ -3248,6 +3248,7 @@ private void EmitChatNotification(string text, string? sessionKey = null)
         var notification = new OpenClawNotification
         {
             Message = displayText,
+            FullMessage = text,
             IsChat = true,
             SessionKey = sessionKey
         };
diff --git a/src/OpenClaw.Tray.WinUI/App.xaml.cs b/src/OpenClaw.Tray.WinUI/App.xaml.cs
index 4126d4def..d2ca42036 100644
--- a/src/OpenClaw.Tray.WinUI/App.xaml.cs
+++ b/src/OpenClaw.Tray.WinUI/App.xaml.cs
@@ -2672,6 +2672,8 @@ private void OnGatewayNotificationReceived(object? sender, OpenClawNotification
         // if the user enabled "Read responses aloud".
         if (notification.IsChat && !string.IsNullOrEmpty(notification.Message))
         {
+            var speechText = notification.FullMessage ?? notification.Message;
+
             // Suppress TTS/voice overlay when the user has aborted the response.
             if (ChatProvider?.IsResponseSuppressed == true)
                 return;
@@ -2692,7 +2694,7 @@ private void OnGatewayNotificationReceived(object? sender, OpenClawNotification
             // TTS: read response aloud whenever the toggle is on (any chat surface).
             if (_settings?.VoiceTtsEnabled == true)
             {
-                _ = (_chatCoordinator?.SpeakResponseAsync(notification.Message) ?? Task.CompletedTask);
+                _ = (_chatCoordinator?.SpeakResponseAsync(speechText) ?? Task.CompletedTask);
             }
         }
 
diff --git a/tests/OpenClaw.Shared.Tests/OpenClawGatewayClientTests.cs b/tests/OpenClaw.Shared.Tests/OpenClawGatewayClientTests.cs
index be62eee5c..1008e1560 100644
--- a/tests/OpenClaw.Shared.Tests/OpenClawGatewayClientTests.cs
+++ b/tests/OpenClaw.Shared.Tests/OpenClawGatewayClientTests.cs
@@ -990,6 +990,37 @@ public void ProcessRawMessage_SessionMessageAssistantNotification_DependsOnFinal
         }
     }
 
+    [Fact]
+    public void ProcessRawMessage_SessionMessageAssistantNotification_PreservesFullMessage()
+    {
+        var helper = new GatewayClientTestHelper();
+        OpenClawNotification? notification = null;
+        helper.Client.NotificationReceived += (_, value) => notification = value;
+
+        var fullMessage = new string('x', 240);
+
+        helper.ProcessRawMessage($$"""
+        {
+          "type": "event",
+          "event": "session.message",
+          "payload": {
+            "sessionKey": "agent:main:whatsapp:direct:+15551234567",
+            "message": {
+              "role": "assistant",
+              "content": "{{fullMessage}}",
+              "timestamp": 1781631280633
+            },
+            "state": "final"
+          }
+        }
+        """);
+
+        Assert.NotNull(notification);
+        Assert.True(notification!.IsChat);
+        Assert.Equal(fullMessage[..200] + "…", notification.Message);
+        Assert.Equal(fullMessage, notification.FullMessage);
+    }
+
     [Fact]
     public void ProcessRawMessage_AgentEventLogsRawLengthWithoutPayloadContent()
     {