Added in Thiago fix

src/crewai/flow/flow.py

@@ -137,6 +137,12 @@ class Flow(Generic[T], metaclass=FlowMeta):
     _routers: Dict[str, str] = {}
     initial_state: Union[Type[T], T, None] = None
 
+    def __class_getitem__(cls, item):
+        class _FlowGeneric(cls):
+            _initial_state_T = item
+
+        return _FlowGeneric
+
     def __init__(self):
         print("[Flow.__init__] Initializing Flow")
         self._methods: Dict[str, Callable] = {}
@@ -152,6 +158,8 @@ class Flow(Generic[T], metaclass=FlowMeta):
 
     def _create_initial_state(self) -> T:
         print("[Flow._create_initial_state] Creating initial state")
+        if self.initial_state is None and hasattr(self, "_initial_state_T"):
+            return self._initial_state_T()  # type: ignore
         if self.initial_state is None:
             return {}  # type: ignore
         elif isinstance(self.initial_state, type):