diff --git a/libs/langchain_v1/langchain/agents/middleware/todo.py b/libs/langchain_v1/langchain/agents/middleware/todo.py
index 06563f6b9f3..15781d85cfd 100644
--- a/libs/langchain_v1/langchain/agents/middleware/todo.py
+++ b/libs/langchain_v1/langchain/agents/middleware/todo.py
@@ -149,9 +149,7 @@ def _write_todos(
     return Command(
         update={
             "todos": todos,
-            "messages": [
-                ToolMessage("Todo list updated.", tool_call_id=runtime.tool_call_id)
-            ],
+            "messages": [ToolMessage("Todo list updated.", tool_call_id=runtime.tool_call_id)],
         }
     )