diff --git a/libs/langgraph/langgraph/types.py b/libs/langgraph/langgraph/types.py
index 01073e62d..222e37866 100644
--- a/libs/langgraph/langgraph/types.py
+++ b/libs/langgraph/langgraph/types.py
@@ -302,6 +302,8 @@ def _update_as_tuples(self) -> Sequence[tuple[str, Any]]:
     PARENT: ClassVar[Literal["__parent__"]] = "__parent__"
 
 
+StreamChunk = tuple[tuple[str, ...], str, Any]
+
 class StreamProtocol:
     __slots__ = ("modes", "__call__")