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fix: interrupt stream mode values (#6475)

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This PR improves the consistency of interrupt streaming. 

- when streaming with stream_mode values, the stream chunk now contains
the entire state alongside the interrupt:

```python
class State(TypedDict):
    robot_input: str
# at this point in time robot_input is already set to  "beep boop i am a robot"
app.stream(..., stream_mode="values")
# before
{"__interrupt__": (Interrupt(value="interrupt",))}}
# after
{"robot_input": "beep boop i am a robot", "__interrupt__": (Interrupt(value="interrupt"))}
```

- when streaming with stream_mode=["values", "updates"], interrupts are
surfaced in both an update stream chunk and the value stream chunk, when
previously we keep interrupt in values only if we request values mode
only

```python
class State(TypedDict):
    robot_input: str
# at this point in time robot_input is already set to  "beep boop i am a robot"
app.stream(..., stream_mode=["values", "updates"])
# before (interrupt would only emit on update chunk, there would be no values chunk)
("updates", {"__interrupt__": (Interrupt(value="interrupt",))}})
# after
("updates", {"__interrupt__": (Interrupt(value="interrupt",))}})
("values", {"robot_input": "beep boop i am a robot", "__interrupt__": (Interrupt(value="interrupt"))})
```

For housekeeping: this PR improves on this revert:
https://github.com/langchain-ai/langgraph/pull/6141
This commit is contained in:
Caspar Broekhuizen
2025-11-20 14:23:09 -08:00
committed by GitHub
parent f8006b2fee
commit 2284a54b64
4 changed files with 109 additions and 10 deletions
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libs/prebuilt/tests/test_react_agent.py
+3 -2
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@@ -638,8 +638,9 @@ def test_react_agent_parallel_tool_calls(
for event in agent.stream(
{"messages": [("user", query)]}, config, stream_mode="values"
):
if messages := event.get("messages"):
message_types.append([m.type for m in messages])
if "__interrupt__" not in event:
if messages := event.get("messages"):
message_types.append([m.type for m in messages])
if version == "v1":
assert message_types == [