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

graph stream with stream_mode=updates miss tool messages when using tools that return Command #361

New Issue
Closed
opened 2026-02-20 17:38:31 -05:00 by yindo · 4 comments
yindo commented 2026-02-20 17:38:31 -05:00
Owner
Copy Link
Copy Source

Originally created by @rayshen92 on GitHub (Dec 19, 2024).

Checked other resources

  • This is a bug, not a usage question. For questions, please use GitHub Discussions.
  • I added a clear and detailed title that summarizes the issue.
  • I read what a minimal reproducible example is (https://stackoverflow.com/help/minimal-reproducible-example).
  • I included a self-contained, minimal example that demonstrates the issue INCLUDING all the relevant imports. The code run AS IS to reproduce the issue.

Example Code

import os

from langchain_core.messages import ToolMessage
from langchain_core.runnables import RunnableConfig
from langchain_core.tools import tool
from langchain_core.tools.base import InjectedToolCallId
from langgraph.types import Command

from typing_extensions import Annotated


@tool
def add(
    a: int,
    b: int,
    tool_call_id: Annotated[str, InjectedToolCallId],
    config: RunnableConfig,
):
    """add two numbers"""

    result = a + b

    return Command(
        update={
            "messages": [
                ToolMessage(f"add result: {result}", tool_call_id=tool_call_id)
            ],
        }
    )


@tool
def sub(
    a: int,
    b: int,
    tool_call_id: Annotated[str, InjectedToolCallId],
    config: RunnableConfig,
):
    """sub two numbers"""

    result = a + b

    return f"sub result: {result}"


from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent

model = ChatOpenAI(
    model="gpt-4o",
)

from langgraph.checkpoint.memory import MemorySaver

memory = MemorySaver()

tools = [add, sub]
agent = create_react_agent(model, tools=tools, checkpointer=memory)

config = {
    "configurable": {"thread_id": "1"},
}

# use add tool
for chunk in agent.stream(
    input={
        "messages": [
            (
                "user",
                "add(1,1), add(1,2), add(1,3) at once",
            ),
        ]
    },
    config=config,
    stream_mode="updates",
):
    for node, values in chunk.items():
        print(f"Receiving update from node: '{node}'")
        print(values)
        print("\n\n")

# use sub tool
for chunk in agent.stream(
    input={
        "messages": [
            (
                "user",
                "sub(1,1), sub(1,2), sub(1,3) at once",
            ),
        ]
    },
    config=config,
    stream_mode="updates",
):
    for node, values in chunk.items():
        print(f"Receiving update from node: '{node}'")
        print(values)
        print("\n\n")

print("======================message history=================\n\n")
cur_state = agent.get_state(config)
messages = cur_state.values.get("messages", [])
for message in messages:
    message.pretty_print()

Error Message and Stack Trace (if applicable)

Receiving update from node: 'agent'
{'messages': [AIMessage(content='', additional_kwargs={'tool_calls': [{'id': 'call_vvaLfOBoaWoxaCtkF0kKAWAJ', 'function': {'arguments': '{"a": 1, "b": 1}', 'name': 'add'}, 'type': 'function'}, {'id': 'call_aYTuKfiWaF8ldAR4cfqU5VXj', 'function': {'arguments': '{"a": 1, "b": 2}', 'name': 'add'}, 'type': 'function'}, {'id': 'call_qO6RfVysJhQ8gP6DaSNpSg6v', 'function': {'arguments': '{"a": 1, "b": 3}', 'name': 'add'}, 'type': 'function'}], 'refusal': None}, response_metadata={'token_usage': {'completion_tokens': 67, 'prompt_tokens': 85, 'total_tokens': 152, 'completion_tokens_details': {'accepted_prediction_tokens': 0, 'audio_tokens': 0, 'reasoning_tokens': 0, 'rejected_prediction_tokens': 0}, 'prompt_tokens_details': {'audio_tokens': 0, 'cached_tokens': 0}}, 'model_name': 'gpt-4o-2024-08-06', 'system_fingerprint': 'fp_f3927aa00d', 'finish_reason': 'tool_calls', 'logprobs': None}, id='run-63311600-238f-4c51-a4cf-70617c0e9da3-0', tool_calls=[{'name': 'add', 'args': {'a': 1, 'b': 1}, 'id': 'call_vvaLfOBoaWoxaCtkF0kKAWAJ', 'type': 'tool_call'}, {'name': 'add', 'args': {'a': 1, 'b': 2}, 'id': 'call_aYTuKfiWaF8ldAR4cfqU5VXj', 'type': 'tool_call'}, {'name': 'add', 'args': {'a': 1, 'b': 3}, 'id': 'call_qO6RfVysJhQ8gP6DaSNpSg6v', 'type': 'tool_call'}], usage_metadata={'input_tokens': 85, 'output_tokens': 67, 'total_tokens': 152, 'input_token_details': {'audio': 0, 'cache_read': 0}, 'output_token_details': {'audio': 0, 'reasoning': 0}})]}



Receiving update from node: 'tools'
{'messages': [ToolMessage(content='add result: 4', name='add', id='11837479-f7b7-4f4d-b245-8a32e5d02776', tool_call_id='call_qO6RfVysJhQ8gP6DaSNpSg6v')]}



Receiving update from node: 'agent'
{'messages': [AIMessage(content='The results of the additions are as follows:\n- \\(1 + 1 = 2\\)\n- \\(1 + 2 = 3\\)\n- \\(1 + 3 = 4\\)', additional_kwargs={'refusal': None}, response_metadata={'token_usage': {'completion_tokens': 43, 'prompt_tokens': 183, 'total_tokens': 226, 'completion_tokens_details': {'accepted_prediction_tokens': 0, 'audio_tokens': 0, 'reasoning_tokens': 0, 'rejected_prediction_tokens': 0}, 'prompt_tokens_details': {'audio_tokens': 0, 'cached_tokens': 0}}, 'model_name': 'gpt-4o-2024-08-06', 'system_fingerprint': 'fp_f3927aa00d', 'finish_reason': 'stop', 'logprobs': None}, id='run-8b12c0d2-9b5a-4a6a-8d5f-56cc773c83a4-0', usage_metadata={'input_tokens': 183, 'output_tokens': 43, 'total_tokens': 226, 'input_token_details': {'audio': 0, 'cache_read': 0}, 'output_token_details': {'audio': 0, 'reasoning': 0}})]}



Receiving update from node: 'agent'
{'messages': [AIMessage(content='', additional_kwargs={'tool_calls': [{'id': 'call_vMYScsWHPGVSLMD9hS8fDA5Q', 'function': {'arguments': '{"a": 1, "b": 1}', 'name': 'sub'}, 'type': 'function'}, {'id': 'call_nxtqJoafmwh6qtFO9f5lhVBt', 'function': {'arguments': '{"a": 1, "b": 2}', 'name': 'sub'}, 'type': 'function'}, {'id': 'call_vXrXRc4IClKzKZ3dRmABGISU', 'function': {'arguments': '{"a": 1, "b": 3}', 'name': 'sub'}, 'type': 'function'}], 'refusal': None}, response_metadata={'token_usage': {'completion_tokens': 67, 'prompt_tokens': 253, 'total_tokens': 320, 'completion_tokens_details': None, 'prompt_tokens_details': None}, 'model_name': 'gpt-4o-2024-08-06', 'system_fingerprint': 'fp_04751d0b65', 'finish_reason': 'tool_calls', 'logprobs': None}, id='run-bb8e32b7-eea5-4d59-a7a1-69973a99a1be-0', tool_calls=[{'name': 'sub', 'args': {'a': 1, 'b': 1}, 'id': 'call_vMYScsWHPGVSLMD9hS8fDA5Q', 'type': 'tool_call'}, {'name': 'sub', 'args': {'a': 1, 'b': 2}, 'id': 'call_nxtqJoafmwh6qtFO9f5lhVBt', 'type': 'tool_call'}, {'name': 'sub', 'args': {'a': 1, 'b': 3}, 'id': 'call_vXrXRc4IClKzKZ3dRmABGISU', 'type': 'tool_call'}], usage_metadata={'input_tokens': 253, 'output_tokens': 67, 'total_tokens': 320, 'input_token_details': {}, 'output_token_details': {}})]}



Receiving update from node: 'tools'
{'messages': [ToolMessage(content='sub result: 2', name='sub', id='f7dfa2fb-d578-46b6-a39d-4523ac1abaed', tool_call_id='call_vMYScsWHPGVSLMD9hS8fDA5Q'), ToolMessage(content='sub result: 3', name='sub', id='c3be1d0d-7575-4ec0-be00-4e181964241a', tool_call_id='call_nxtqJoafmwh6qtFO9f5lhVBt'), ToolMessage(content='sub result: 4', name='sub', id='8d5fad1f-9fbb-4acf-be78-a766de53d322', tool_call_id='call_vXrXRc4IClKzKZ3dRmABGISU')]}



Receiving update from node: 'agent'
{'messages': [AIMessage(content='The results of the subtractions are as follows:\n- \\(1 - 1 = 0\\)\n- \\(1 - 2 = -1\\)\n- \\(1 - 3 = -2\\)', additional_kwargs={'refusal': None}, response_metadata={'token_usage': {'completion_tokens': 44, 'prompt_tokens': 351, 'total_tokens': 395, 'completion_tokens_details': {'accepted_prediction_tokens': 0, 'audio_tokens': 0, 'reasoning_tokens': 0, 'rejected_prediction_tokens': 0}, 'prompt_tokens_details': {'audio_tokens': 0, 'cached_tokens': 0}}, 'model_name': 'gpt-4o-2024-08-06', 'system_fingerprint': 'fp_f3927aa00d', 'finish_reason': 'stop', 'logprobs': None}, id='run-f94e074c-18ce-4513-9f1a-ff19be9c2532-0', usage_metadata={'input_tokens': 351, 'output_tokens': 44, 'total_tokens': 395, 'input_token_details': {'audio': 0, 'cache_read': 0}, 'output_token_details': {'audio': 0, 'reasoning': 0}})]}



======================message history=================


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

add(1,1), add(1,2), add(1,3) at once
================================== Ai Message ==================================
Tool Calls:
  add (call_vvaLfOBoaWoxaCtkF0kKAWAJ)
 Call ID: call_vvaLfOBoaWoxaCtkF0kKAWAJ
  Args:
    a: 1
    b: 1
  add (call_aYTuKfiWaF8ldAR4cfqU5VXj)
 Call ID: call_aYTuKfiWaF8ldAR4cfqU5VXj
  Args:
    a: 1
    b: 2
  add (call_qO6RfVysJhQ8gP6DaSNpSg6v)
 Call ID: call_qO6RfVysJhQ8gP6DaSNpSg6v
  Args:
    a: 1
    b: 3
================================= Tool Message =================================
Name: add

add result: 2
================================= Tool Message =================================
Name: add

add result: 3
================================= Tool Message =================================
Name: add

add result: 4
================================== Ai Message ==================================

The results of the additions are as follows:
- \(1 + 1 = 2\)
- \(1 + 2 = 3\)
- \(1 + 3 = 4\)
================================ Human Message =================================

sub(1,1), sub(1,2), sub(1,3) at once
================================== Ai Message ==================================
Tool Calls:
  sub (call_vMYScsWHPGVSLMD9hS8fDA5Q)
 Call ID: call_vMYScsWHPGVSLMD9hS8fDA5Q
  Args:
    a: 1
    b: 1
  sub (call_nxtqJoafmwh6qtFO9f5lhVBt)
 Call ID: call_nxtqJoafmwh6qtFO9f5lhVBt
  Args:
    a: 1
    b: 2
  sub (call_vXrXRc4IClKzKZ3dRmABGISU)
 Call ID: call_vXrXRc4IClKzKZ3dRmABGISU
  Args:
    a: 1
    b: 3
================================= Tool Message =================================
Name: sub

sub result: 2
================================= Tool Message =================================
Name: sub

sub result: 3
================================= Tool Message =================================
Name: sub

sub result: 4
================================== Ai Message ==================================

The results of the subtractions are as follows:
- \(1 - 1 = 0\)
- \(1 - 2 = -1\)
- \(1 - 3 = -2\)

Description

I'm trying to use Command in tools to update graph state from tools,
when i call stream func with stream_mode=updates, if the llm call multiple tools at once, only the tool messages related to last tool is stream out, others not output.

if i define tool without return command, it works.

System Info

System Information

OS: Linux
OS Version: #1 SMP Sat Oct 7 17:52:50 CST 2023
Python Version: 3.12.7 | packaged by Anaconda, Inc. | (main, Oct 4 2024, 13:27:36) [GCC 11.2.0]

Package Information

langchain_core: 0.3.25
langsmith: 0.1.140
langchain_openai: 0.2.6
langgraph_sdk: 0.1.47

Optional packages not installed

langserve

Other Dependencies

httpx: 0.27.0
jsonpatch: 1.33
openai: 1.54.3
orjson: 3.10.3
packaging: 24.0
pydantic: 2.7.4
PyYAML: 6.0.1
requests: 2.32.3
requests-toolbelt: 1.0.0
tenacity: 9.0.0
tiktoken: 0.8.0
typing-extensions: 4.12.2

Originally created by @rayshen92 on GitHub (Dec 19, 2024). ### Checked other resources - [X] This is a bug, not a usage question. For questions, please use GitHub Discussions. - [X] I added a clear and detailed title that summarizes the issue. - [X] I read what a minimal reproducible example is (https://stackoverflow.com/help/minimal-reproducible-example). - [X] I included a self-contained, minimal example that demonstrates the issue INCLUDING all the relevant imports. The code run AS IS to reproduce the issue. ### Example Code ```python import os from langchain_core.messages import ToolMessage from langchain_core.runnables import RunnableConfig from langchain_core.tools import tool from langchain_core.tools.base import InjectedToolCallId from langgraph.types import Command from typing_extensions import Annotated @tool def add( a: int, b: int, tool_call_id: Annotated[str, InjectedToolCallId], config: RunnableConfig, ): """add two numbers""" result = a + b return Command( update={ "messages": [ ToolMessage(f"add result: {result}", tool_call_id=tool_call_id) ], } ) @tool def sub( a: int, b: int, tool_call_id: Annotated[str, InjectedToolCallId], config: RunnableConfig, ): """sub two numbers""" result = a + b return f"sub result: {result}" from langchain_openai import ChatOpenAI from langgraph.prebuilt import create_react_agent model = ChatOpenAI( model="gpt-4o", ) from langgraph.checkpoint.memory import MemorySaver memory = MemorySaver() tools = [add, sub] agent = create_react_agent(model, tools=tools, checkpointer=memory) config = { "configurable": {"thread_id": "1"}, } # use add tool for chunk in agent.stream( input={ "messages": [ ( "user", "add(1,1), add(1,2), add(1,3) at once", ), ] }, config=config, stream_mode="updates", ): for node, values in chunk.items(): print(f"Receiving update from node: '{node}'") print(values) print("\n\n") # use sub tool for chunk in agent.stream( input={ "messages": [ ( "user", "sub(1,1), sub(1,2), sub(1,3) at once", ), ] }, config=config, stream_mode="updates", ): for node, values in chunk.items(): print(f"Receiving update from node: '{node}'") print(values) print("\n\n") print("======================message history=================\n\n") cur_state = agent.get_state(config) messages = cur_state.values.get("messages", []) for message in messages: message.pretty_print() ``` ### Error Message and Stack Trace (if applicable) ```shell Receiving update from node: 'agent' {'messages': [AIMessage(content='', additional_kwargs={'tool_calls': [{'id': 'call_vvaLfOBoaWoxaCtkF0kKAWAJ', 'function': {'arguments': '{"a": 1, "b": 1}', 'name': 'add'}, 'type': 'function'}, {'id': 'call_aYTuKfiWaF8ldAR4cfqU5VXj', 'function': {'arguments': '{"a": 1, "b": 2}', 'name': 'add'}, 'type': 'function'}, {'id': 'call_qO6RfVysJhQ8gP6DaSNpSg6v', 'function': {'arguments': '{"a": 1, "b": 3}', 'name': 'add'}, 'type': 'function'}], 'refusal': None}, response_metadata={'token_usage': {'completion_tokens': 67, 'prompt_tokens': 85, 'total_tokens': 152, 'completion_tokens_details': {'accepted_prediction_tokens': 0, 'audio_tokens': 0, 'reasoning_tokens': 0, 'rejected_prediction_tokens': 0}, 'prompt_tokens_details': {'audio_tokens': 0, 'cached_tokens': 0}}, 'model_name': 'gpt-4o-2024-08-06', 'system_fingerprint': 'fp_f3927aa00d', 'finish_reason': 'tool_calls', 'logprobs': None}, id='run-63311600-238f-4c51-a4cf-70617c0e9da3-0', tool_calls=[{'name': 'add', 'args': {'a': 1, 'b': 1}, 'id': 'call_vvaLfOBoaWoxaCtkF0kKAWAJ', 'type': 'tool_call'}, {'name': 'add', 'args': {'a': 1, 'b': 2}, 'id': 'call_aYTuKfiWaF8ldAR4cfqU5VXj', 'type': 'tool_call'}, {'name': 'add', 'args': {'a': 1, 'b': 3}, 'id': 'call_qO6RfVysJhQ8gP6DaSNpSg6v', 'type': 'tool_call'}], usage_metadata={'input_tokens': 85, 'output_tokens': 67, 'total_tokens': 152, 'input_token_details': {'audio': 0, 'cache_read': 0}, 'output_token_details': {'audio': 0, 'reasoning': 0}})]} Receiving update from node: 'tools' {'messages': [ToolMessage(content='add result: 4', name='add', id='11837479-f7b7-4f4d-b245-8a32e5d02776', tool_call_id='call_qO6RfVysJhQ8gP6DaSNpSg6v')]} Receiving update from node: 'agent' {'messages': [AIMessage(content='The results of the additions are as follows:\n- \\(1 + 1 = 2\\)\n- \\(1 + 2 = 3\\)\n- \\(1 + 3 = 4\\)', additional_kwargs={'refusal': None}, response_metadata={'token_usage': {'completion_tokens': 43, 'prompt_tokens': 183, 'total_tokens': 226, 'completion_tokens_details': {'accepted_prediction_tokens': 0, 'audio_tokens': 0, 'reasoning_tokens': 0, 'rejected_prediction_tokens': 0}, 'prompt_tokens_details': {'audio_tokens': 0, 'cached_tokens': 0}}, 'model_name': 'gpt-4o-2024-08-06', 'system_fingerprint': 'fp_f3927aa00d', 'finish_reason': 'stop', 'logprobs': None}, id='run-8b12c0d2-9b5a-4a6a-8d5f-56cc773c83a4-0', usage_metadata={'input_tokens': 183, 'output_tokens': 43, 'total_tokens': 226, 'input_token_details': {'audio': 0, 'cache_read': 0}, 'output_token_details': {'audio': 0, 'reasoning': 0}})]} Receiving update from node: 'agent' {'messages': [AIMessage(content='', additional_kwargs={'tool_calls': [{'id': 'call_vMYScsWHPGVSLMD9hS8fDA5Q', 'function': {'arguments': '{"a": 1, "b": 1}', 'name': 'sub'}, 'type': 'function'}, {'id': 'call_nxtqJoafmwh6qtFO9f5lhVBt', 'function': {'arguments': '{"a": 1, "b": 2}', 'name': 'sub'}, 'type': 'function'}, {'id': 'call_vXrXRc4IClKzKZ3dRmABGISU', 'function': {'arguments': '{"a": 1, "b": 3}', 'name': 'sub'}, 'type': 'function'}], 'refusal': None}, response_metadata={'token_usage': {'completion_tokens': 67, 'prompt_tokens': 253, 'total_tokens': 320, 'completion_tokens_details': None, 'prompt_tokens_details': None}, 'model_name': 'gpt-4o-2024-08-06', 'system_fingerprint': 'fp_04751d0b65', 'finish_reason': 'tool_calls', 'logprobs': None}, id='run-bb8e32b7-eea5-4d59-a7a1-69973a99a1be-0', tool_calls=[{'name': 'sub', 'args': {'a': 1, 'b': 1}, 'id': 'call_vMYScsWHPGVSLMD9hS8fDA5Q', 'type': 'tool_call'}, {'name': 'sub', 'args': {'a': 1, 'b': 2}, 'id': 'call_nxtqJoafmwh6qtFO9f5lhVBt', 'type': 'tool_call'}, {'name': 'sub', 'args': {'a': 1, 'b': 3}, 'id': 'call_vXrXRc4IClKzKZ3dRmABGISU', 'type': 'tool_call'}], usage_metadata={'input_tokens': 253, 'output_tokens': 67, 'total_tokens': 320, 'input_token_details': {}, 'output_token_details': {}})]} Receiving update from node: 'tools' {'messages': [ToolMessage(content='sub result: 2', name='sub', id='f7dfa2fb-d578-46b6-a39d-4523ac1abaed', tool_call_id='call_vMYScsWHPGVSLMD9hS8fDA5Q'), ToolMessage(content='sub result: 3', name='sub', id='c3be1d0d-7575-4ec0-be00-4e181964241a', tool_call_id='call_nxtqJoafmwh6qtFO9f5lhVBt'), ToolMessage(content='sub result: 4', name='sub', id='8d5fad1f-9fbb-4acf-be78-a766de53d322', tool_call_id='call_vXrXRc4IClKzKZ3dRmABGISU')]} Receiving update from node: 'agent' {'messages': [AIMessage(content='The results of the subtractions are as follows:\n- \\(1 - 1 = 0\\)\n- \\(1 - 2 = -1\\)\n- \\(1 - 3 = -2\\)', additional_kwargs={'refusal': None}, response_metadata={'token_usage': {'completion_tokens': 44, 'prompt_tokens': 351, 'total_tokens': 395, 'completion_tokens_details': {'accepted_prediction_tokens': 0, 'audio_tokens': 0, 'reasoning_tokens': 0, 'rejected_prediction_tokens': 0}, 'prompt_tokens_details': {'audio_tokens': 0, 'cached_tokens': 0}}, 'model_name': 'gpt-4o-2024-08-06', 'system_fingerprint': 'fp_f3927aa00d', 'finish_reason': 'stop', 'logprobs': None}, id='run-f94e074c-18ce-4513-9f1a-ff19be9c2532-0', usage_metadata={'input_tokens': 351, 'output_tokens': 44, 'total_tokens': 395, 'input_token_details': {'audio': 0, 'cache_read': 0}, 'output_token_details': {'audio': 0, 'reasoning': 0}})]} ======================message history================= ================================ Human Message ================================= add(1,1), add(1,2), add(1,3) at once ================================== Ai Message ================================== Tool Calls: add (call_vvaLfOBoaWoxaCtkF0kKAWAJ) Call ID: call_vvaLfOBoaWoxaCtkF0kKAWAJ Args: a: 1 b: 1 add (call_aYTuKfiWaF8ldAR4cfqU5VXj) Call ID: call_aYTuKfiWaF8ldAR4cfqU5VXj Args: a: 1 b: 2 add (call_qO6RfVysJhQ8gP6DaSNpSg6v) Call ID: call_qO6RfVysJhQ8gP6DaSNpSg6v Args: a: 1 b: 3 ================================= Tool Message ================================= Name: add add result: 2 ================================= Tool Message ================================= Name: add add result: 3 ================================= Tool Message ================================= Name: add add result: 4 ================================== Ai Message ================================== The results of the additions are as follows: - \(1 + 1 = 2\) - \(1 + 2 = 3\) - \(1 + 3 = 4\) ================================ Human Message ================================= sub(1,1), sub(1,2), sub(1,3) at once ================================== Ai Message ================================== Tool Calls: sub (call_vMYScsWHPGVSLMD9hS8fDA5Q) Call ID: call_vMYScsWHPGVSLMD9hS8fDA5Q Args: a: 1 b: 1 sub (call_nxtqJoafmwh6qtFO9f5lhVBt) Call ID: call_nxtqJoafmwh6qtFO9f5lhVBt Args: a: 1 b: 2 sub (call_vXrXRc4IClKzKZ3dRmABGISU) Call ID: call_vXrXRc4IClKzKZ3dRmABGISU Args: a: 1 b: 3 ================================= Tool Message ================================= Name: sub sub result: 2 ================================= Tool Message ================================= Name: sub sub result: 3 ================================= Tool Message ================================= Name: sub sub result: 4 ================================== Ai Message ================================== The results of the subtractions are as follows: - \(1 - 1 = 0\) - \(1 - 2 = -1\) - \(1 - 3 = -2\) ``` ### Description I'm trying to use Command in tools to update graph state from tools, when i call stream func with stream_mode=updates, if the llm call multiple tools at once, only the tool messages related to last tool is stream out, others not output. if i define tool without return command, it works. ### System Info System Information ------------------ > OS: Linux > OS Version: #1 SMP Sat Oct 7 17:52:50 CST 2023 > Python Version: 3.12.7 | packaged by Anaconda, Inc. | (main, Oct 4 2024, 13:27:36) [GCC 11.2.0] Package Information ------------------- > langchain_core: 0.3.25 > langsmith: 0.1.140 > langchain_openai: 0.2.6 > langgraph_sdk: 0.1.47 Optional packages not installed ------------------------------- > langserve Other Dependencies ------------------ > httpx: 0.27.0 > jsonpatch: 1.33 > openai: 1.54.3 > orjson: 3.10.3 > packaging: 24.0 > pydantic: 2.7.4 > PyYAML: 6.0.1 > requests: 2.32.3 > requests-toolbelt: 1.0.0 > tenacity: 9.0.0 > tiktoken: 0.8.0 > typing-extensions: 4.12.2
yindo closed this issue 2026-02-20 17:38:31 -05:00
yindo commented 2026-02-20 17:38:33 -05:00
Author
Owner
Copy Link
Copy Source

@rayshen92 commented on GitHub (Dec 19, 2024):

add tool call 3 times, but only stream out the last call tool messages.

@rayshen92 commented on GitHub (Dec 19, 2024): add tool call 3 times, but only stream out the last call tool messages.
yindo commented 2026-02-20 17:38:35 -05:00
Author
Owner
Copy Link
Copy Source

@rayshen92 commented on GitHub (Dec 19, 2024):

i found the bug is from this:

https://github.com/langchain-ai/langgraph/blob/fa61be9fbcbc09afbe828dab4b89155958050ec4/libs/langgraph/langgraph/pregel/io.py#L197

@rayshen92 commented on GitHub (Dec 19, 2024): i found the bug is from this: https://github.com/langchain-ai/langgraph/blob/fa61be9fbcbc09afbe828dab4b89155958050ec4/libs/langgraph/langgraph/pregel/io.py#L197
yindo commented 2026-02-20 17:38:36 -05:00
Author
Owner
Copy Link
Copy Source

@vbarda commented on GitHub (Dec 19, 2024):

Thanks for reporting -- this is indeed a broader issue with nodes returning lists of updates, e.g.:

from langgraph.graph import StateGraph, START
from langgraph.types import Command
from typing import TypedDict, Annotated
import operator

class State(TypedDict):
    foo: Annotated[str, operator.add]

def node_a(state):
    return [Command(update={"foo": "a1"}), Command(update={"foo": "a2"})]

def node_b(state):
    return {"foo": "b"}

graph = StateGraph(State).add_sequence([node_a, node_b]).add_edge(START, "node_a").compile()

# graph.invoke({"foo": ""}) # -> returns full expected output

# only streams the last update from node_a
for chunk in graph.stream({"foo": ""}, stream_mode="updates"):
    print(chunk)
    print("\n\n")

We'll fix this up

@vbarda commented on GitHub (Dec 19, 2024): Thanks for reporting -- this is indeed a broader issue with nodes returning lists of updates, e.g.: ```python from langgraph.graph import StateGraph, START from langgraph.types import Command from typing import TypedDict, Annotated import operator class State(TypedDict): foo: Annotated[str, operator.add] def node_a(state): return [Command(update={"foo": "a1"}), Command(update={"foo": "a2"})] def node_b(state): return {"foo": "b"} graph = StateGraph(State).add_sequence([node_a, node_b]).add_edge(START, "node_a").compile() # graph.invoke({"foo": ""}) # -> returns full expected output # only streams the last update from node_a for chunk in graph.stream({"foo": ""}, stream_mode="updates"): print(chunk) print("\n\n") ``` We'll fix this up
yindo commented 2026-02-20 17:38:38 -05:00
Author
Owner
Copy Link
Copy Source

@rayshen92 commented on GitHub (Jan 8, 2025):

thanks to fix the issue, but i found this create another issue.

#2962

@rayshen92 commented on GitHub (Jan 8, 2025): thanks to fix the issue, but i found this create another issue. #2962
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
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#361
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?