langchain-ai/langgraph
1
0
Fork 0
mirror of https://github.com/langchain-ai/langgraph.git synced 2026-07-15 12:35:43 -04:00
Code Issues 314 Packages Projects Releases 17 Wiki Activity

[PR #4583] Implement post_model_hook and HumanInterruptNode #3932

New Issue
Closed
opened 2026-02-20 17:49:23 -05:00 by yindo · 0 comments
yindo commented 2026-02-20 17:49:23 -05:00
Owner
Copy Link
Copy Source

Original Pull Request: https://github.com/langchain-ai/langgraph/pull/4583

State: closed
Merged: Yes

Sample usage:

from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent
from langgraph.checkpoint.memory import InMemorySaver
from langgraph.prebuilt.interrupt import HumanInterruptConfig, InterruptToolNode

def get_weather(city: str) -> str:
    """Get the weather for a given city."""
    return f"The weather in {city} is sunny."


agent = create_react_agent(
    ChatOpenAI(model="gpt-3.5-turbo",),
    tools=[get_weather],
    prompt="You are a helpful weather assistant.",
    post_model_hook=InterruptToolNode(
        get_weather=HumanInterruptConfig(
              allow_accept=True,
              allow_edit=True,
              allow_ignore=True,
              allow_respond=True,
          )
    ),
    checkpointer=InMemorySaver(),
)

Sample behavior:

==============================================================
RUNNING: ./test_prebuilts/accept.py
==============================================================

================================ Human Message =================================

what is the weather in sf?
================================== Ai Message ==================================
Tool Calls:
  get_weather (call_TJaaMv6iXNTxmusv3hxJKCB0)
 Call ID: call_TJaaMv6iXNTxmusv3hxJKCB0
  Args:
    city: San Francisco
================================= Tool Message =================================
Name: get_weather

The weather in San Francisco is sunny.
================================== Ai Message ==================================

The weather in San Francisco is sunny.



==============================================================
RUNNING: ./test_prebuilts/edit.py
==============================================================

================================ Human Message =================================

what is the weather in sf?
================================== Ai Message ==================================
Tool Calls:
  get_weather (call_fI8cjf7SWc4V7Y0z6ahNIQHY)
 Call ID: call_fI8cjf7SWc4V7Y0z6ahNIQHY
  Args:
    city: new york city
================================= Tool Message =================================
Name: get_weather

The weather in new york city is sunny.
================================== Ai Message ==================================

The weather in New York City is sunny.



==============================================================
RUNNING: ./test_prebuilts/ignore.py
==============================================================

================================ Human Message =================================

what is the weather in sf?
================================== Ai Message ==================================
Tool Calls:
  get_weather (call_EoDCkXb60mh0tAzCPov2ipCF)
 Call ID: call_EoDCkXb60mh0tAzCPov2ipCF
  Args:
    city: San Francisco
================================= Tool Message =================================
Name: get_weather

User ignored the tool call: get_weather:call_EoDCkXb60mh0tAzCPov2ipCF
================================== Ai Message ==================================

I'm sorry, but I couldn't retrieve the weather information for San Francisco at the moment. Let me try again.
Tool Calls:
  get_weather (call_9U9pJKDili3Al0uu187ykIuF)
 Call ID: call_9U9pJKDili3Al0uu187ykIuF
  Args:
    city: San Francisco



==============================================================
RUNNING: ./test_prebuilts/response.py
==============================================================

================================ Human Message =================================

what is the weather in sf?
================================== Ai Message ==================================
Tool Calls:
  get_weather (call_jaUBParDqSQrKvPyiEH6pMFS)
 Call ID: call_jaUBParDqSQrKvPyiEH6pMFS
  Args:
    city: San Francisco
================================= Tool Message =================================
Name: get_weather

actually, please fetch the weather in NYC
================================== Ai Message ==================================
Tool Calls:
  get_weather (call_2KeaoS4u1WZ7QpFgwFQfadBe)
 Call ID: call_2KeaoS4u1WZ7QpFgwFQfadBe
  Args:
    city: New York City
================================= Tool Message =================================
Name: get_weather

The weather in New York City is sunny.
================================== Ai Message ==================================

The weather in New York City is sunny.
**Original Pull Request:** https://github.com/langchain-ai/langgraph/pull/4583 **State:** closed **Merged:** Yes --- Sample usage: ```py from langchain_openai import ChatOpenAI from langgraph.prebuilt import create_react_agent from langgraph.checkpoint.memory import InMemorySaver from langgraph.prebuilt.interrupt import HumanInterruptConfig, InterruptToolNode def get_weather(city: str) -> str: """Get the weather for a given city.""" return f"The weather in {city} is sunny." agent = create_react_agent( ChatOpenAI(model="gpt-3.5-turbo",), tools=[get_weather], prompt="You are a helpful weather assistant.", post_model_hook=InterruptToolNode( get_weather=HumanInterruptConfig( allow_accept=True, allow_edit=True, allow_ignore=True, allow_respond=True, ) ), checkpointer=InMemorySaver(), ) ``` Sample behavior: ``` ============================================================== RUNNING: ./test_prebuilts/accept.py ============================================================== ================================ Human Message ================================= what is the weather in sf? ================================== Ai Message ================================== Tool Calls: get_weather (call_TJaaMv6iXNTxmusv3hxJKCB0) Call ID: call_TJaaMv6iXNTxmusv3hxJKCB0 Args: city: San Francisco ================================= Tool Message ================================= Name: get_weather The weather in San Francisco is sunny. ================================== Ai Message ================================== The weather in San Francisco is sunny. ============================================================== RUNNING: ./test_prebuilts/edit.py ============================================================== ================================ Human Message ================================= what is the weather in sf? ================================== Ai Message ================================== Tool Calls: get_weather (call_fI8cjf7SWc4V7Y0z6ahNIQHY) Call ID: call_fI8cjf7SWc4V7Y0z6ahNIQHY Args: city: new york city ================================= Tool Message ================================= Name: get_weather The weather in new york city is sunny. ================================== Ai Message ================================== The weather in New York City is sunny. ============================================================== RUNNING: ./test_prebuilts/ignore.py ============================================================== ================================ Human Message ================================= what is the weather in sf? ================================== Ai Message ================================== Tool Calls: get_weather (call_EoDCkXb60mh0tAzCPov2ipCF) Call ID: call_EoDCkXb60mh0tAzCPov2ipCF Args: city: San Francisco ================================= Tool Message ================================= Name: get_weather User ignored the tool call: get_weather:call_EoDCkXb60mh0tAzCPov2ipCF ================================== Ai Message ================================== I'm sorry, but I couldn't retrieve the weather information for San Francisco at the moment. Let me try again. Tool Calls: get_weather (call_9U9pJKDili3Al0uu187ykIuF) Call ID: call_9U9pJKDili3Al0uu187ykIuF Args: city: San Francisco ============================================================== RUNNING: ./test_prebuilts/response.py ============================================================== ================================ Human Message ================================= what is the weather in sf? ================================== Ai Message ================================== Tool Calls: get_weather (call_jaUBParDqSQrKvPyiEH6pMFS) Call ID: call_jaUBParDqSQrKvPyiEH6pMFS Args: city: San Francisco ================================= Tool Message ================================= Name: get_weather actually, please fetch the weather in NYC ================================== Ai Message ================================== Tool Calls: get_weather (call_2KeaoS4u1WZ7QpFgwFQfadBe) Call ID: call_2KeaoS4u1WZ7QpFgwFQfadBe Args: city: New York City ================================= Tool Message ================================= Name: get_weather The weather in New York City is sunny. ================================== Ai Message ================================== The weather in New York City is sunny. ```
yindo added the pull-request label 2026-02-20 17:49:23 -05:00
yindo closed this issue 2026-02-20 17:49:23 -05:00
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
agents
awaiting author revision
bug
change
chat models
checkpointer
ci
code quality
code quality
dependencies
documentation
drawing
duplicate
enhancement
good first issue
help wanted
invalid
maintainer
meta
missing information
not maintained by langchain
open-swe-auto
open-swe-max
open-swe-max-auto
pending
performance
pull-request
Mirrored from GitHub Pull Request
 question
requires design
sdk
server
stale
studio
tests
type checking
usage question
v0.5
v1.1
No Label pull-request
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
yindo
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: langchain-ai/langgraph#3932
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?