Weird interrupt related issue

[CymDanus]

I have a functional and working graph which works perfectly fine like it should.
However when I use the interrupt function within a node I created called "human_feedback_node" the interrupt just does nothing and forcefully quits the execution. If I add a try and except clause, it doesn't exit from the program but it doesn't ask me for anything. I understand its entering the except clause because its an interrupt but why doesn't it ask me for input?

Here is the related code -

from typing import Literal
from langgraph.types import Command
from graph.state import State
from graph.consts import *
from langchain_core.messages import HumanMessage
from langgraph.types import interrupt

def human_feedback_node(state: State) -> Command[Literal[SUPERVISOR_NODE]]:
    """Human feedback node that processes user input and updates the state."""
    
    # Get the user feedback from the state
    user_feedback = interrupt("Do you approve of the output?\n")
    print(f"User feedback: {user_feedback}")
    # Add the user feedback as a message to the state
    return Command(
        resume=user_feedback,
        update={
            "messages": [
                HumanMessage(content=user_feedback, name="human_feedback_node")
            ]
        },
        goto=SUPERVISOR_NODE
    ) 

Here is the video of it happening

Screen.Recording.2025-01-16.at.10.14.21.mov

[hinthornw]

Thanks for writing in. That sounds like interrupt is behaving as designed.

It raises a node interrupt exception, which LangGraph interprets as an instruction to pause the graph execution. The interrupt message is emitted in the stream output and stored in the persistence layer (for when you get the state of the graph). You then resume the graph with the response value.

See e.g., the doc:
https://langchain-ai.github.io/langgraph/concepts/human_in_the_loop/#how-does-resuming-from-an-interrupt-work