diff --git a/frontend/src/navigation/MobileTopBar.test.tsx b/frontend/src/navigation/MobileTopBar.test.tsx
index 37733702..5b241e2c 100644
--- a/frontend/src/navigation/MobileTopBar.test.tsx
+++ b/frontend/src/navigation/MobileTopBar.test.tsx
@@ -179,4 +179,54 @@ describe('MobileTopBar', () => {
     expect(menuItem('navigation.editAgent')).toBeDefined();
     expect(menuItem('convTile.share')).toBeUndefined();
   });
+
+  it('keeps the menu on a chat or owned agent with an empty name', () => {
+    render({
+      title: '',
+      conversationId: 'c1',
+      editAgentPath: '/agents/edit/a1',
+      onRename: () => {},
+      onDelete: () => {},
+    });
+
+    const title = container.querySelector('[data-testid="mobile-title"]')!;
+    expect(title.tagName).toBe('BUTTON');
+    expect(title.textContent).toContain('newChat');
+    openMenu(title);
+    expect(menuItem('navigation.editAgent')).toBeDefined();
+    expect(menuItem('convTile.rename')).toBeDefined();
+  });
+
+  it('drops a rename in progress when the conversation changes', () => {
+    const onRename = vi.fn();
+    const props = { title: 'Router drops', onRename, onDelete: () => {} };
+    render({ ...props, conversationId: 'c1' });
+
+    openMenu(container.querySelector('[data-testid="mobile-title"]')!);
+    act(() => menuItem('convTile.rename')!.click());
+    expect(container.querySelector('input')).not.toBeNull();
+
+    render({ ...props, title: 'Other chat', conversationId: 'c2' });
+    expect(container.querySelector('input')).toBeNull();
+    expect(button('convTile.save')).toBeNull();
+    expect(onRename).not.toHaveBeenCalled();
+  });
+
+  it('closes an open share when the conversation changes', () => {
+    const props = {
+      title: 'Router drops',
+      onRename: () => {},
+      onDelete: () => {},
+    };
+    render({ ...props, conversationId: 'c1' });
+
+    openMenu(container.querySelector('[data-testid="mobile-title"]')!);
+    act(() => menuItem('convTile.share')!.click());
+    expect(
+      document.querySelector('[data-testid="share-modal"]'),
+    ).not.toBeNull();
+
+    render({ ...props, conversationId: 'c2' });
+    expect(document.querySelector('[data-testid="share-modal"]')).toBeNull();
+  });
 });
diff --git a/frontend/src/navigation/MobileTopBar.tsx b/frontend/src/navigation/MobileTopBar.tsx
index 6018d302..297f3378 100644
--- a/frontend/src/navigation/MobileTopBar.tsx
+++ b/frontend/src/navigation/MobileTopBar.tsx
@@ -87,6 +87,15 @@ export default function MobileTopBar({
   const [isShareOpen, setIsShareOpen] = useState(false);
   const [deleteModalState, setDeleteModalState] =
     useState<ActiveState>('INACTIVE');
+  // A rename, share or delete belongs to the chat it started on. The bar
+  // stays mounted across chats, so drop any that is open when the chat changes.
+  const [actionsFor, setActionsFor] = useState(conversationId);
+  if (actionsFor !== conversationId) {
+    setActionsFor(conversationId);
+    setIsEditing(false);
+    setIsShareOpen(false);
+    setDeleteModalState('INACTIVE');
+  }
 
   const actions: TitleAction[] = [];
   if (editAgentPath) {
@@ -176,8 +185,8 @@ export default function MobileTopBar({
         </div>
       );
     }
-    if (!title) return null;
     if (actions.length === 0) {
+      if (!title) return null;
       return (
         <span
           data-testid="mobile-title"
@@ -203,8 +212,8 @@ export default function MobileTopBar({
             className="min-w-0 shrink"
           >
             {agentMark}
-            <span className="truncate" title={title}>
-              {title}
+            <span className="truncate" title={title || undefined}>
+              {title || t('newChat')}
             </span>
             <ChevronDown className="text-muted-foreground" aria-hidden />
           </Button>