Remove unused when values for Interrupt

libs/langgraph/langgraph/constants.py

@@ -102,5 +102,5 @@ class Send:
 
 @dataclass
 class Interrupt:
-    when: Literal["before", "during", "after"]
-    value: Any = None
+    value: Any
+    when: Literal["during"] = "during"

libs/langgraph/langgraph/errors.py

@@ -40,7 +40,7 @@ class NodeInterrupt(GraphInterrupt):
     """Raised by a node to interrupt execution."""
 
     def __init__(self, value: Any) -> None:
-        super().__init__([Interrupt("during", value)])
+        super().__init__([Interrupt(value)])
 
 
 class EmptyInputError(Exception):

libs/langgraph/tests/test_pregel.py

@@ -6383,7 +6383,7 @@ def test_dynamic_interrupt(snapshot: SnapshotAssertion) -> None:
                 PregelTask(
                     AnyStr(),
                     "tool_two",
-                    interrupts=(Interrupt("during", "Just because..."),),
+                    interrupts=(Interrupt("Just because..."),),
                 ),
             ),
             config=tool_two.checkpointer.get_tuple(thread1).config,

libs/langgraph/tests/test_pregel_async.py

@@ -285,7 +285,7 @@ async def test_dynamic_interrupt(
             PregelTask(
                 AnyStr(),
                 "tool_two",
-                interrupts=(Interrupt("during", "Just because..."),),
+                interrupts=(Interrupt("Just because..."),),
             ),
         ),
         config=tup.config,