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createReactAgent does not support parallel tool callings in streaming mode #286

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opened 2026-02-15 18:15:30 -05:00 by yindo · 3 comments
yindo commented 2026-02-15 18:15:30 -05:00
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Originally created by @postbird on GitHub (Jun 17, 2025).

I am using the createReactAgent to build a simple agent with one tool, and I am using the AzureChatOpenAI.

The issue is that when the model returns two parallel tool_calls, there are something wrong.

How should I process the parallel tool_calls? Or should I disable parallel tool calling？

I do not see any params can let me disable parallel tool calling with createReactAgent https://langchain-ai.github.io/langgraphjs/reference/types/langgraph_prebuilt.CreateReactAgentParams.html

Image

["values",{"messages":[{"lc":1,"type":"constructor","id":["langchain_core","messages","HumanMessage"],"kwargs":{"id":"-19698eb3-f28b-41dc-afba-f0b39beac826","content":"the weather in London and Paris","additional_kwargs":{},"response_metadata":{}}},{"lc":1,"type":"constructor","id":["langchain_core","messages","AIMessageChunk"],"kwargs":{"content":"I'll get the weather information for both London and Paris for you.","additional_kwargs":{"tool_calls":[{"index":0,"id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","type":"function","function":{"name":"weather_toolweather_tool","arguments":"{\"city\": \"London\"}{\"city\": \"Paris\"}"}}]},"response_metadata":{"usage":{"completion_tokens":3,"prompt_tokens":438,"total_tokens":441}},"tool_call_chunks":[{"name":"weather_toolweather_tool","args":"{\"city\": \"London\"}{\"city\": \"Paris\"}","id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","index":0,"type":"tool_call_chunk"}],"id":"msg_vrtx_01FABieqWPAKSZNAky2SmW17","usage_metadata":{"input_tokens":438,"output_tokens":107,"total_tokens":545},"tool_calls":[],"invalid_tool_calls":[{"name":"weather_toolweather_tool","args":"{\"city\": \"London\"}{\"city\": \"Paris\"}","id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","error":"Malformed args.","type":"invalid_tool_call"}]}}]}]

Versions of lang stack packages I am using:

"@langchain/core": "^0.3.57",
"@langchain/langgraph": "^0.3.0",
"@langchain/openai": "^0.5.11",

The agent defination（one tool named weatherTool）:

  const agent = createReactAgent({
    llm: model,
    tools: [weatherTool],
    prompt:
      'You are a good assistant, you can use tool and reply to user, but you can only use English to reply',
    checkpointSaver: LANGGRAPH_MEMORY_SAVER,
  });

streamMode I am using:

   streamMode: ['updates', 'custom', 'messages', 'values'],

user input:

the weather in London and Paris

streaming messages chunk list:

["values",{"messages":[{"lc":1,"type":"constructor","id":["langchain_core","messages","HumanMessage"],"kwargs":{"id":"-19698eb3-f28b-41dc-afba-f0b39beac826","content":"the weather in London and Paris","additional_kwargs":{},"response_metadata":{}}}]}]
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["values",{"messages":[{"lc":1,"type":"constructor","id":["langchain_core","messages","HumanMessage"],"kwargs":{"id":"-19698eb3-f28b-41dc-afba-f0b39beac826","content":"the weather in London and Paris","additional_kwargs":{},"response_metadata":{}}},{"lc":1,"type":"constructor","id":["langchain_core","messages","AIMessageChunk"],"kwargs":{"content":"I'll get the weather information for both London and Paris for you.","additional_kwargs":{"tool_calls":[{"index":0,"id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","type":"function","function":{"name":"weather_toolweather_tool","arguments":"{\"city\": \"London\"}{\"city\": \"Paris\"}"}}]},"response_metadata":{"usage":{"completion_tokens":3,"prompt_tokens":438,"total_tokens":441}},"tool_call_chunks":[{"name":"weather_toolweather_tool","args":"{\"city\": \"London\"}{\"city\": \"Paris\"}","id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","index":0,"type":"tool_call_chunk"}],"id":"msg_vrtx_01FABieqWPAKSZNAky2SmW17","usage_metadata":{"input_tokens":438,"output_tokens":107,"total_tokens":545},"tool_calls":[],"invalid_tool_calls":[{"name":"weather_toolweather_tool","args":"{\"city\": \"London\"}{\"city\": \"Paris\"}","id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","error":"Malformed args.","type":"invalid_tool_call"}]}}]}]
Originally created by @postbird on GitHub (Jun 17, 2025). I am using the `createReactAgent` to build a simple agent with one tool, and I am using the `AzureChatOpenAI`. The issue is that when the model returns two parallel tool_calls, there are something wrong. How should I process the parallel tool_calls? Or should I disable parallel tool calling？ > I do not see any params can let me disable parallel tool calling with `createReactAgent` https://langchain-ai.github.io/langgraphjs/reference/types/langgraph_prebuilt.CreateReactAgentParams.html ![Image](https://github.com/user-attachments/assets/66c9a503-83eb-4693-90b1-e502e58bb69c) ```ts ["values",{"messages":[{"lc":1,"type":"constructor","id":["langchain_core","messages","HumanMessage"],"kwargs":{"id":"-19698eb3-f28b-41dc-afba-f0b39beac826","content":"the weather in London and Paris","additional_kwargs":{},"response_metadata":{}}},{"lc":1,"type":"constructor","id":["langchain_core","messages","AIMessageChunk"],"kwargs":{"content":"I'll get the weather information for both London and Paris for you.","additional_kwargs":{"tool_calls":[{"index":0,"id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","type":"function","function":{"name":"weather_toolweather_tool","arguments":"{\"city\": \"London\"}{\"city\": \"Paris\"}"}}]},"response_metadata":{"usage":{"completion_tokens":3,"prompt_tokens":438,"total_tokens":441}},"tool_call_chunks":[{"name":"weather_toolweather_tool","args":"{\"city\": \"London\"}{\"city\": \"Paris\"}","id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","index":0,"type":"tool_call_chunk"}],"id":"msg_vrtx_01FABieqWPAKSZNAky2SmW17","usage_metadata":{"input_tokens":438,"output_tokens":107,"total_tokens":545},"tool_calls":[],"invalid_tool_calls":[{"name":"weather_toolweather_tool","args":"{\"city\": \"London\"}{\"city\": \"Paris\"}","id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","error":"Malformed args.","type":"invalid_tool_call"}]}}]}] ``` **Versions of lang stack packages I am using:** ``` "@langchain/core": "^0.3.57", "@langchain/langgraph": "^0.3.0", "@langchain/openai": "^0.5.11", ``` **The agent defination（one tool named weatherTool）:** ```ts const agent = createReactAgent({ llm: model, tools: [weatherTool], prompt: 'You are a good assistant, you can use tool and reply to user, but you can only use English to reply', checkpointSaver: LANGGRAPH_MEMORY_SAVER, }); ``` **streamMode I am using:** ``` streamMode: ['updates', 'custom', 'messages', 'values'], ``` user input: ```bash the weather in London and Paris ``` streaming messages chunk list: ```ts ["values",{"messages":[{"lc":1,"type":"constructor","id":["langchain_core","messages","HumanMessage"],"kwargs":{"id":"-19698eb3-f28b-41dc-afba-f0b39beac826","content":"the weather in London and Paris","additional_kwargs":{},"response_metadata":{}}}]}] 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["messages",[{"lc":1,"type":"constructor","id":["langchain_core","messages","AIMessageChunk"],"kwargs":{"content":"","tool_call_chunks":[{"id":"","index":0,"type":"tool_call_chunk"}],"additional_kwargs":{"tool_calls":[{"index":0,"id":"","type":"function","function":{}}]},"id":"","response_metadata":{"usage":{}},"tool_calls":[{"name":"","args":{},"id":"","type":"tool_call"}],"invalid_tool_calls":[]}},{"tags":["seq:step:2"],"thread_id":"1750155244464","run_id":"-4ae83be9-4d73-44da-93d7-430aed5fc3e5","langgraph_step":1,"langgraph_node":"agent","langgraph_triggers":["branch:to:agent"],"langgraph_path":["__pregel_pull","agent"],"langgraph_checkpoint_ns":"agent:fd419395-3f32-5876-912d-7e8a847587e5","__pregel_task_id":"fd419395-3f32-5876-912d-7e8a847587e5","checkpoint_ns":"agent:fd419395-3f32-5876-912d-7e8a847587e5","ls_provider":"azure","ls_model_name":"gcp-claude4-sonnet","ls_model_type":"chat","ls_temperature":0,"ls_max_tokens":8192}]] ["messages",[{"lc":1,"type":"constructor","id":["langchain_core","messages","AIMessageChunk"],"kwargs":{"content":"","tool_call_chunks":[{"args":"{\"city\":","id":"","index":0,"type":"tool_call_chunk"}],"additional_kwargs":{"tool_calls":[{"index":0,"id":"","type":"function","function":{"arguments":"{\"city\":"}}]},"id":"","response_metadata":{"usage":{}},"tool_calls":[],"invalid_tool_calls":[{"args":"{\"city\":","id":"","error":"Malformed 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weather information for both London and Paris for you.","additional_kwargs":{"tool_calls":[{"index":0,"id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","type":"function","function":{"name":"weather_toolweather_tool","arguments":"{\"city\": \"London\"}{\"city\": \"Paris\"}"}}]},"response_metadata":{"usage":{"completion_tokens":3,"prompt_tokens":438,"total_tokens":441}},"tool_call_chunks":[{"name":"weather_toolweather_tool","args":"{\"city\": \"London\"}{\"city\": \"Paris\"}","id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","index":0,"type":"tool_call_chunk"}],"id":"msg_vrtx_01FABieqWPAKSZNAky2SmW17","usage_metadata":{"input_tokens":438,"output_tokens":107,"total_tokens":545},"tool_calls":[],"invalid_tool_calls":[{"name":"weather_toolweather_tool","args":"{\"city\": \"London\"}{\"city\": \"Paris\"}","id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","error":"Malformed 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\"Paris\"}","id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","index":0,"type":"tool_call_chunk"}],"id":"msg_vrtx_01FABieqWPAKSZNAky2SmW17","usage_metadata":{"input_tokens":438,"output_tokens":107,"total_tokens":545},"tool_calls":[],"invalid_tool_calls":[{"name":"weather_toolweather_tool","args":"{\"city\": \"London\"}{\"city\": \"Paris\"}","id":"toolu_vrtx_01NtFxPRameyYEvsYYUrNH1Ltoolu_vrtx_011uWT8jXj6xqU2qJhKQ45ZU","error":"Malformed args.","type":"invalid_tool_call"}]}}]}] ```
yindo added the enhancementgood first issue labels 2026-02-15 18:15:30 -05:00
yindo closed this issue 2026-02-15 18:15:30 -05:00
yindo commented 2026-02-15 18:15:31 -05:00
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@postbird commented on GitHub (Jun 17, 2025):

How to disable parallel tool calling with createReactAgent ?
Tried #977 but got error.

@postbird commented on GitHub (Jun 17, 2025): How to disable parallel tool calling with `createReactAgent` ? Tried #977 but got error.
yindo commented 2026-02-15 18:15:32 -05:00
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@govardhan27 commented on GitHub (Aug 18, 2025):

Hi, I'd like to work on this issue. Can you assign it to me?

@govardhan27 commented on GitHub (Aug 18, 2025): Hi, I'd like to work on this issue. Can you assign it to me?
yindo commented 2026-02-15 18:15:32 -05:00
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@dqbd commented on GitHub (Sep 11, 2025):

Hello! Cannot reproduce the example while using @langchain/openai and @langchain/langgraph^0.3, so closing the stale issue, but:

  1. With @langchain/langgraph 0.4.3 we've improved handling of partial application of tool calls, which may be applicable here.
  2. You can use the following code to disable parallel tool calling. Do note that it's up to the underlying provider to support these arguments, so for instance Vertex AI might not support disabling parallel tool calls.
const agent = createReactAgent({
  llm: model.bindTools([weatherTool], { parallel_tool_calls: false }),
  tools: [weatherTool],
  prompt:
    "You are a good assistant, you can use tool and reply to user, but you can only use English to reply",
  checkpointSaver: new MemorySaver(),
});
@dqbd commented on GitHub (Sep 11, 2025): Hello! Cannot reproduce the example while using `@langchain/openai` and `@langchain/langgraph^0.3`, so closing the stale issue, but: 1. With `@langchain/langgraph` 0.4.3 we've improved handling of partial application of tool calls, which may be applicable here. 2. You can use the following code to disable parallel tool calling. Do note that it's up to the underlying provider to support these arguments, so for instance Vertex AI might not support disabling parallel tool calls. ```typescript const agent = createReactAgent({ llm: model.bindTools([weatherTool], { parallel_tool_calls: false }), tools: [weatherTool], prompt: "You are a good assistant, you can use tool and reply to user, but you can only use English to reply", checkpointSaver: new MemorySaver(), }); ```
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Reference: langchain-ai/langgraphjs#286
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