diff --git a/packages/ui/src/components/chat/ChatContainer.tsx b/packages/ui/src/components/chat/ChatContainer.tsx
index 35a28c07..6ab7e364 100644
--- a/packages/ui/src/components/chat/ChatContainer.tsx
+++ b/packages/ui/src/components/chat/ChatContainer.tsx
@@ -586,7 +586,40 @@ export const ChatContainer: React.FC<ChatContainerProps> = ({ autoOpenDraft = tr
             {t('chat.container.returnToParent.label')}
         </Button>
     ) : null;
-    const promptReadOnly = readOnly || (Boolean(parentSession) && !allowPromptingSubagentSessions);
+    const promptReadOnly = parentSession ? !allowPromptingSubagentSessions : readOnly;
+
+    React.useEffect(() => {
+        if (typeof window === 'undefined' || window.parent === window) {
+            return;
+        }
+
+        const applySetting = (value: boolean) => {
+            useUIStore.getState().setAllowPromptingSubagentSessions(value);
+        };
+        const scopedWindow = window as typeof window & {
+            __openchamberApplyChatSettingsSync?: (payload: { allowPromptingSubagentSessions: boolean }) => void;
+        };
+        const applySync = (payload: { allowPromptingSubagentSessions: boolean }) => {
+            applySetting(payload.allowPromptingSubagentSessions);
+        };
+        const handleMessage = (event: MessageEvent) => {
+            if (event.source !== window.parent || event.origin !== window.location.origin) return;
+            const data = event.data as { type?: unknown; payload?: { allowPromptingSubagentSessions?: unknown } };
+            if (data?.type !== 'openchamber:chat-settings-sync'
+                || typeof data.payload?.allowPromptingSubagentSessions !== 'boolean') return;
+            applySetting(data.payload.allowPromptingSubagentSessions);
+        };
+
+        scopedWindow.__openchamberApplyChatSettingsSync = applySync;
+        window.addEventListener('message', handleMessage);
+        window.parent.postMessage({ type: 'openchamber:chat-settings-request' }, window.location.origin);
+        return () => {
+            window.removeEventListener('message', handleMessage);
+            if (scopedWindow.__openchamberApplyChatSettingsSync === applySync) {
+                delete scopedWindow.__openchamberApplyChatSettingsSync;
+            }
+        };
+    }, []);
 
     React.useEffect(() => {
         if (autoOpenDraft && !currentSessionId && !draftOpen) {
diff --git a/packages/ui/src/components/chat/ChatMessage.tsx b/packages/ui/src/components/chat/ChatMessage.tsx
index 58485d5e..320031eb 100644
--- a/packages/ui/src/components/chat/ChatMessage.tsx
+++ b/packages/ui/src/components/chat/ChatMessage.tsx
@@ -1017,6 +1017,7 @@ const ChatMessage: React.FC<ChatMessageProps> = ({
                                                 isUser={isUser}
                                                 isMessageCompleted={isMessageCompleted}
                                                 messageFinish={messageFinish}
+                                                messageCreatedAt={messageCreatedAt ?? undefined}
                                                  isMobile={isMobile}
                                                  alwaysShowActions={alwaysShowMessageActions}
                                                  hasTouchInput={hasTouchInput}
@@ -1050,6 +1051,7 @@ const ChatMessage: React.FC<ChatMessageProps> = ({
                                                 isUser={isUser}
                                                 isMessageCompleted={isMessageCompleted}
                                                 messageFinish={messageFinish}
+                                                messageCreatedAt={messageCreatedAt ?? undefined}
                                                  isMobile={isMobile}
                                                  alwaysShowActions={alwaysShowMessageActions}
                                                  hasTouchInput={hasTouchInput}
diff --git a/packages/ui/src/components/layout/ContextPanel.tsx b/packages/ui/src/components/layout/ContextPanel.tsx
index de5e3026..23086158 100644
--- a/packages/ui/src/components/layout/ContextPanel.tsx
+++ b/packages/ui/src/components/layout/ContextPanel.tsx
@@ -2070,6 +2070,7 @@ export const ContextPanel: React.FC = () => {
   const reorderContextPanelTabs = useUIStore((state) => state.reorderContextPanelTabs);
   const setSelectedFilePath = useFilesViewTabsStore((state) => state.setSelectedPath);
   const openContextPreview = useUIStore((state) => state.openContextPreview);
+  const allowPromptingSubagentSessions = useUIStore((state) => state.allowPromptingSubagentSessions);
   const { themeMode, setThemeMode, lightThemeId, darkThemeId, currentTheme } = useThemeSystem();
 
   const tabs = React.useMemo(() => panelState?.tabs ?? [], [panelState?.tabs]);
@@ -2359,6 +2360,30 @@ export const ContextPanel: React.FC = () => {
     }
   }, [currentTheme, darkThemeId, lightThemeId, themeMode]);
 
+  const postChatSettingsSyncToEmbeddedChat = React.useCallback(() => {
+    if (typeof window === 'undefined') return;
+
+    const payload = { allowPromptingSubagentSessions };
+    for (const frame of chatFrameRefs.current.values()) {
+      const frameWindow = frame.contentWindow;
+      if (!frameWindow) continue;
+
+      const directSync = (frameWindow as unknown as {
+        __openchamberApplyChatSettingsSync?: (settings: typeof payload) => void;
+      }).__openchamberApplyChatSettingsSync;
+      if (typeof directSync === 'function') {
+        try {
+          directSync(payload);
+          continue;
+        } catch {
+          // fallback to postMessage below
+        }
+      }
+
+      frameWindow.postMessage({ type: 'openchamber:chat-settings-sync', payload }, window.location.origin);
+    }
+  }, [allowPromptingSubagentSessions]);
+
   const postEmbeddedVisibilityToChats = React.useCallback(() => {
     if (typeof window === 'undefined') {
       return;
@@ -2411,6 +2436,10 @@ export const ContextPanel: React.FC = () => {
       }
 
       const data = event.data as { type?: unknown };
+      if (data?.type === 'openchamber:chat-settings-request') {
+        postChatSettingsSyncToEmbeddedChat();
+        return;
+      }
       if (data?.type !== 'openchamber:cycle-theme-request') {
         return;
       }
@@ -2423,7 +2452,7 @@ export const ContextPanel: React.FC = () => {
 
     window.addEventListener('message', handleMessage);
     return () => window.removeEventListener('message', handleMessage);
-  }, [setThemeMode, themeMode]);
+  }, [postChatSettingsSyncToEmbeddedChat, setThemeMode, themeMode]);
 
   React.useLayoutEffect(() => {
     const hasAnyChatTab = tabs.some((tab) => tab.mode === 'chat');
@@ -2432,8 +2461,9 @@ export const ContextPanel: React.FC = () => {
     }
 
     postThemeSyncToEmbeddedChat();
+    postChatSettingsSyncToEmbeddedChat();
     postEmbeddedVisibilityToChats();
-  }, [darkThemeId, lightThemeId, postEmbeddedVisibilityToChats, postThemeSyncToEmbeddedChat, tabs, themeMode]);
+  }, [darkThemeId, lightThemeId, postChatSettingsSyncToEmbeddedChat, postEmbeddedVisibilityToChats, postThemeSyncToEmbeddedChat, tabs, themeMode]);
 
   const tabItems = React.useMemo(() => tabs.map((tab) => {
     const rawLabel = getTabLabel(tab, sessionTitleById, t);
@@ -2628,6 +2658,7 @@ export const ContextPanel: React.FC = () => {
               )}
               onLoad={() => {
                 postThemeSyncToEmbeddedChat();
+                postChatSettingsSyncToEmbeddedChat();
                 postEmbeddedVisibilityToChats();
               }}
             />