diff --git a/libs/langgraph/langgraph/channels/dynamic_barrier_value.py b/libs/langgraph/langgraph/channels/dynamic_barrier_value.py
index 4f75f2a8c..48fb3c7db 100644
--- a/libs/langgraph/langgraph/channels/dynamic_barrier_value.py
+++ b/libs/langgraph/langgraph/channels/dynamic_barrier_value.py
@@ -1,3 +1,4 @@
+from collections.abc import Set
 from typing import Any, Generic, NamedTuple, Optional, Sequence, Type, Union
 
 from typing_extensions import Self
@@ -8,7 +9,7 @@ from langgraph.errors import EmptyChannelError, InvalidUpdateError
 
 
 class WaitForNames(NamedTuple):
-    names: set[Any]
+    names: Set[Any]
 
 
 class DynamicBarrierValue(
@@ -25,7 +26,7 @@ class DynamicBarrierValue(
 
     __slots__ = ("names", "seen")
 
-    names: Optional[set[Value]]
+    names: Optional[Set[Value]]
     seen: set[Value]
 
     def __init__(self, typ: Type[Value]) -> None:
@@ -54,11 +55,11 @@ class DynamicBarrierValue(
         empty.seen = self.seen.copy()
         return empty
 
-    def checkpoint(self) -> tuple[Optional[set[Value]], set[Value]]:
+    def checkpoint(self) -> tuple[Optional[Set[Value]], set[Value]]:
         return (self.names, self.seen)
 
     def from_checkpoint(
-        self, checkpoint: tuple[Optional[set[Value]], set[Value]]
+        self, checkpoint: tuple[Optional[Set[Value]], set[Value]]
     ) -> Self:
         empty = self.__class__(self.typ)
         empty.key = self.key
diff --git a/libs/langgraph/langgraph/graph/branch.py b/libs/langgraph/langgraph/graph/branch.py
index ce0f8bd55..8e3b847f5 100644
--- a/libs/langgraph/langgraph/graph/branch.py
+++ b/libs/langgraph/langgraph/graph/branch.py
@@ -133,16 +133,6 @@ class Branch(NamedTuple):
         writer: Writer,
         reader: Optional[Callable[[RunnableConfig], Any]] = None,
     ) -> RunnableCallable:
-        print(
-            list(
-                zip_longest(
-                    writer([e for e in self.ends.values() if e != END]),
-                    [la for la, e in self.ends.items() if e != END],
-                )
-            )
-            if self.ends
-            else None
-        )
         return ChannelWrite.register_writer(
             RunnableCallable(
                 func=self._route,
@@ -156,7 +146,7 @@ class Branch(NamedTuple):
             list(
                 zip_longest(
                     writer([e for e in self.ends.values() if e != END]),
-                    [la for la, e in self.ends.items() if e != END],
+                    [str(la) for la, e in self.ends.items() if e != END],
                 )
             )
             if self.ends
diff --git a/libs/langgraph/langgraph/pregel/draw.py b/libs/langgraph/langgraph/pregel/draw.py
index d6092e978..6c6cff9fd 100644
--- a/libs/langgraph/langgraph/pregel/draw.py
+++ b/libs/langgraph/langgraph/pregel/draw.py
@@ -1,8 +1,8 @@
 from collections import defaultdict
-from typing import Any, Mapping, Optional, Sequence, Union
+from typing import Any, Mapping, Optional, Sequence, Union, cast
 
 from langchain_core.runnables.config import RunnableConfig
-from langchain_core.runnables.graph import Graph
+from langchain_core.runnables.graph import Graph, Node
 
 from langgraph.channels.base import BaseChannel
 from langgraph.checkpoint.base import BaseCheckpointSaver
@@ -45,7 +45,7 @@ def draw_graph(
         The graph for this Pregel instance.
     """
     # (src, dest, is_conditional)
-    edges: set[tuple[str, str, bool]] = set()
+    edges: set[tuple[str, str, bool, Optional[str]]] = set()
 
     step = -1
     checkpoint = empty_checkpoint()
@@ -204,8 +204,8 @@ def draw_graph(
                 first, last = graph.extend(subgraph, prefix=name)
                 for idx, edge in enumerate(graph.edges):
                     if edge.source == name:
-                        graph.edges[idx] = edge.copy(source=last.id)
+                        graph.edges[idx] = edge.copy(source=cast(Node, last).id)
                     elif edge.target == name:
-                        graph.edges[idx] = edge.copy(target=first.id)
+                        graph.edges[idx] = edge.copy(target=cast(Node, first).id)
 
         return graph
diff --git a/libs/langgraph/langgraph/pregel/write.py b/libs/langgraph/langgraph/pregel/write.py
index 42637efc0..c1badb549 100644
--- a/libs/langgraph/langgraph/pregel/write.py
+++ b/libs/langgraph/langgraph/pregel/write.py
@@ -165,6 +165,10 @@ class ChannelWrite(RunnableCallable):
             ] or None
         elif writes := getattr(runnable, "_is_channel_writer", MISSING):
             if writes is not MISSING:
+                writes = cast(
+                    Sequence[tuple[Union[ChannelWriteEntry, Send], Optional[str]]],
+                    writes,
+                )
                 entries = [e for e, _ in writes]
                 labels = [la for _, la in writes]
                 return [(*t, la) for t, la in zip(_assemble_writes(entries), labels)]