diff --git a/HellionChat/IpcManager.cs b/HellionChat/IpcManager.cs
index b70e49f..cbade56 100755
--- a/HellionChat/IpcManager.cs
+++ b/HellionChat/IpcManager.cs
@@ -19,6 +19,26 @@ internal sealed class IpcManager : IDisposable
         object?
     > InvokeGate { get; }
 
+    // v1.4.9 R4: ChatTwo IPC compatibility mirror. Third-party plugins with
+    // a no-fork policy (e.g. Artisan, AllaganTools) only subscribe to the
+    // ChatTwo.*-prefixed context-menu integration gates. Mirroring all four
+    // provider slots under the ChatTwo namespace lets those plugins keep
+    // working without code changes on their side. Conflict detection
+    // prevents ChatTwo and HellionChat from loading in parallel, so no slot
+    // collision risk.
+    private ICallGateProvider<string> ChatTwoRegisterGate { get; }
+    private ICallGateProvider<string, object?> ChatTwoUnregisterGate { get; }
+    private ICallGateProvider<object?> ChatTwoAvailableGate { get; }
+    private ICallGateProvider<
+        string,
+        PlayerPayload?,
+        ulong,
+        Payload?,
+        SeString?,
+        SeString?,
+        object?
+    > ChatTwoInvokeGate { get; }
+
     internal List<string> Registered { get; } = [];
 
     public IpcManager()
@@ -41,7 +61,32 @@ internal sealed class IpcManager : IDisposable
             object?
         >("HellionChat.Invoke");
 
+        // v1.4.9 R4: ChatTwo-prefixed mirrors of the four context-menu slots
+        // above. Share the same Register/Unregister backing methods so a
+        // plugin that subscribes via either namespace lands in the same
+        // Registered list. SendMessage on Invoke fans out to both gates.
+        ChatTwoRegisterGate = Plugin.Interface.GetIpcProvider<string>("ChatTwo.Register");
+        ChatTwoRegisterGate.RegisterFunc(Register);
+
+        ChatTwoAvailableGate = Plugin.Interface.GetIpcProvider<object?>("ChatTwo.Available");
+
+        ChatTwoUnregisterGate = Plugin.Interface.GetIpcProvider<string, object?>(
+            "ChatTwo.Unregister"
+        );
+        ChatTwoUnregisterGate.RegisterAction(Unregister);
+
+        ChatTwoInvokeGate = Plugin.Interface.GetIpcProvider<
+            string,
+            PlayerPayload?,
+            ulong,
+            Payload?,
+            SeString?,
+            SeString?,
+            object?
+        >("ChatTwo.Invoke");
+
         AvailableGate.SendMessage();
+        ChatTwoAvailableGate.SendMessage();
     }
 
     internal void Invoke(
@@ -54,6 +99,8 @@ internal sealed class IpcManager : IDisposable
     )
     {
         InvokeGate.SendMessage(id, sender, contentId, payload, senderString, content);
+        // v1.4.9 R4: fan out the same event to plugins listening on ChatTwo.Invoke.
+        ChatTwoInvokeGate.SendMessage(id, sender, contentId, payload, senderString, content);
     }
 
     private string Register()
@@ -72,6 +119,8 @@ internal sealed class IpcManager : IDisposable
     {
         UnregisterGate.UnregisterAction();
         RegisterGate.UnregisterFunc();
+        ChatTwoUnregisterGate.UnregisterAction();
+        ChatTwoRegisterGate.UnregisterFunc();
         Registered.Clear();
     }
 }