diff --git a/python/packages/autogen-core/docs/src/user-guide/agentchat-user-guide/tutorial/agents.ipynb b/python/packages/autogen-core/docs/src/user-guide/agentchat-user-guide/tutorial/agents.ipynb
index 592b8535c84a..5b14e0e72952 100644
--- a/python/packages/autogen-core/docs/src/user-guide/agentchat-user-guide/tutorial/agents.ipynb
+++ b/python/packages/autogen-core/docs/src/user-guide/agentchat-user-guide/tutorial/agents.ipynb
@@ -324,9 +324,7 @@
     "    def produced_message_types(self) -> List[type[ChatMessage]]:\n",
     "        return [TextMessage]\n",
     "\n",
-    "    async def on_messages(\n",
-    "        self, messages: Sequence[ChatMessage], cancellation_token: CancellationToken\n",
-    "    ) -> AgentMessage | Response:\n",
+    "    async def on_messages(self, messages: Sequence[ChatMessage], cancellation_token: CancellationToken) -> Response:\n",
     "        # Calls the on_messages_stream.\n",
     "        response: Response | None = None\n",
     "        async for message in self.on_messages_stream(messages, cancellation_token):\n",
@@ -338,7 +336,7 @@
     "    async def on_messages_stream(\n",
     "        self, messages: Sequence[ChatMessage], cancellation_token: CancellationToken\n",
     "    ) -> AsyncGenerator[AgentMessage | Response, None]:\n",
-    "        inner_messages = []\n",
+    "        inner_messages: List[AgentMessage] = []\n",
     "        for i in range(self._count, 0, -1):\n",
     "            msg = TextMessage(content=f\"{i}...\", source=self.name)\n",
     "            inner_messages.append(msg)\n",