From 5c0c0fb1869a98dc11f1516cfa8e3e25680d2ec0 Mon Sep 17 00:00:00 2001
From: Isaac Francisco <78627776+isahers1@users.noreply.github.com>
Date: Thu, 7 Aug 2025 08:46:44 -0700
Subject: [PATCH] fix: mypy issue with conditional edges (#5851)

Send should inherit from hashable, and need to use Sequence since List
is invariant.

https://github.com/langchain-ai/langgraph/issues/5850
---
 libs/langgraph/langgraph/graph/_branch.py | 10 +++++-----
 libs/langgraph/langgraph/graph/state.py   | 12 ++++++------
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/libs/langgraph/langgraph/graph/_branch.py b/libs/langgraph/langgraph/graph/_branch.py
index 34ff58a61..fc94e1b41 100644
--- a/libs/langgraph/langgraph/graph/_branch.py
+++ b/libs/langgraph/langgraph/graph/_branch.py
@@ -41,16 +41,16 @@ _Writer = Callable[
 
 
 def _get_branch_path_input_schema(
-    path: Callable[..., Hashable | list[Hashable]]
-    | Callable[..., Awaitable[Hashable | list[Hashable]]]
-    | Runnable[Any, Hashable | list[Hashable]],
+    path: Callable[..., Hashable | Sequence[Hashable]]
+    | Callable[..., Awaitable[Hashable | Sequence[Hashable]]]
+    | Runnable[Any, Hashable | Sequence[Hashable]],
 ) -> type[Any] | None:
     input = None
     # detect input schema annotation in the branch callable
     try:
         callable_: (
-            Callable[..., Hashable | list[Hashable]]
-            | Callable[..., Awaitable[Hashable | list[Hashable]]]
+            Callable[..., Hashable | Sequence[Hashable]]
+            | Callable[..., Awaitable[Hashable | Sequence[Hashable]]]
             | None
         ) = None
         if isinstance(path, (RunnableCallable, RunnableLambda)):
diff --git a/libs/langgraph/langgraph/graph/state.py b/libs/langgraph/langgraph/graph/state.py
index 74c1e496b..2a1a194b7 100644
--- a/libs/langgraph/langgraph/graph/state.py
+++ b/libs/langgraph/langgraph/graph/state.py
@@ -607,9 +607,9 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
     def add_conditional_edges(
         self,
         source: str,
-        path: Callable[..., Hashable | list[Hashable]]
-        | Callable[..., Awaitable[Hashable | list[Hashable]]]
-        | Runnable[Any, Hashable | list[Hashable]],
+        path: Callable[..., Hashable | Sequence[Hashable]]
+        | Callable[..., Awaitable[Hashable | Sequence[Hashable]]]
+        | Runnable[Any, Hashable | Sequence[Hashable]],
         path_map: dict[Hashable, str] | list[str] | None = None,
     ) -> Self:
         """Add a conditional edge from the starting node to any number of destination nodes.
@@ -710,9 +710,9 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
 
     def set_conditional_entry_point(
         self,
-        path: Callable[..., Hashable | list[Hashable]]
-        | Callable[..., Awaitable[Hashable | list[Hashable]]]
-        | Runnable[Any, Hashable | list[Hashable]],
+        path: Callable[..., Hashable | Sequence[Hashable]]
+        | Callable[..., Awaitable[Hashable | Sequence[Hashable]]]
+        | Runnable[Any, Hashable | Sequence[Hashable]],
         path_map: dict[Hashable, str] | list[str] | None = None,
     ) -> Self:
         """Sets a conditional entry point in the graph.