Lint

libs/langgraph/langgraph/graph/state.py

@@ -320,7 +320,7 @@ def add_node(
             )
         if not isinstance(node, str):
             action = node
-            node = getattr(action, "name", getattr(action, "__name__", None))
+            node = cast(str, getattr(action, "name", getattr(action, "__name__", None)))
             if node is None:
                 raise ValueError(
                     "Node name must be provided if action is not a function"