diff --git a/.changeset/mcp-oauth-popup-close-delay.md b/.changeset/mcp-oauth-popup-close-delay.md
new file mode 100644
index 000000000..7fdcc46ad
--- /dev/null
+++ b/.changeset/mcp-oauth-popup-close-delay.md
@@ -0,0 +1,5 @@
+---
+"@truefoundry/trueforge-ui": patch
+---
+
+Stop the MCP OAuth opener from closing the popup as soon as the callback broadcasts, so the success/failure screen can show before the popup closes itself.
diff --git a/packages/trueforge-ui/src/hooks/useMcpAuth.ts b/packages/trueforge-ui/src/hooks/useMcpAuth.ts
index a7d52c735..5839a1d4c 100644
--- a/packages/trueforge-ui/src/hooks/useMcpAuth.ts
+++ b/packages/trueforge-ui/src/hooks/useMcpAuth.ts
@@ -104,16 +104,21 @@ export const useMCPAuth = ({ callbackPath }: UseMCPAuthOptions = {}) => {
     }) => {
       const channel = new BroadcastChannel(MCP_AUTH_POPUP_CHANNEL);
       let popup: Window | null = null;
-      const cleanup = () => {
+      // Close the channel on result; leave the popup open so the callback screen can show
+      // success/failure and close itself.
+      const cleanupChannel = () => {
         channel.close();
+        popupCleanupRef.current.delete(cleanupWithPopup);
+      };
+      const cleanupWithPopup = () => {
+        cleanupChannel();
         popup?.close();
-        popupCleanupRef.current.delete(cleanup);
       };
 
       channel.onmessage = (event: MessageEvent<unknown>) => {
         if (!isPopupMessage(event.data) || event.data.popupUid !== popupUid) return;
         const { isSuccess } = event.data;
-        cleanup();
+        cleanupChannel();
         if (!isSuccess) {
           if (activeAttemptsRef.current.delete(attempt)) callback(false);
           return;
@@ -122,11 +127,11 @@ export const useMCPAuth = ({ callbackPath }: UseMCPAuthOptions = {}) => {
           activeAttemptsRef.current.delete(attempt);
         });
       };
-      popupCleanupRef.current.add(cleanup);
+      popupCleanupRef.current.add(cleanupWithPopup);
 
       popup = window.open(authorizationEndpoint, '_blank', 'popup=true');
       if (!popup) {
-        cleanup();
+        cleanupWithPopup();
         throw new Error('Popup blocked. Please allow pop-ups to authorize the MCP server.');
       }
 
diff --git a/packages/trueforge-ui/test/hooks/useMcpAuth.test.ts b/packages/trueforge-ui/test/hooks/useMcpAuth.test.ts
index cd1e89386..c8fde6e37 100644
--- a/packages/trueforge-ui/test/hooks/useMcpAuth.test.ts
+++ b/packages/trueforge-ui/test/hooks/useMcpAuth.test.ts
@@ -215,7 +215,7 @@ describe('useMCPAuth', () => {
     expect(callback).toHaveBeenCalledOnce();
     expect(callback).toHaveBeenCalledWith(true);
     expect(channel.close).toHaveBeenCalledOnce();
-    expect(close).toHaveBeenCalledOnce();
+    expect(close).not.toHaveBeenCalled();
     expect(showError).not.toHaveBeenCalled();
   });