Unexpected INVALID_CHAT_HISTORY

[eigans]

Hello.

Apologies in advance, if such a question was already asked.

I encountered a weird error today related to INVALID_CHAT_HISTORY error: https://langchain-ai.github.io/langgraph/troubleshooting/errors/INVALID_CHAT_HISTORY/

By the looks of it, all the AI messages with tool use have proper corresponding tool messages. Most probably I am missing something, but I am failing to understand, what exactly. Please advise.

Stack trace

ValueError: Found AIMessages with tool_calls that do not have a corresponding ToolMessage. Here are the first few of those tool calls: [{'name': 'get_task', 'args': {'task_id': 'b55a35af-b676-4501-ab02-08396e00bf4a'}, 'id': 'toolu_01GExmK6qCiDQLv5HrHwFQ8x', 'type': 'tool_call'}, {'name': 'get_project_structure', 'args': {}, 'id': 'toolu_011hpY4uMDjFUTgRBYFMnFV6', 'type': 'tool_call'}, ....

Messages

Here are two messages in a row:

{
"content": [
{
"text": "I'll help you implement the task as requested. First, let's retrieve the task details to understand what needs to be done.",
"type": "text",
"index": 0
},
{
"id": "toolu_01GExmK6qCiDQLv5HrHwFQ8x",
"input": {

    },
    "name": "get_task",
    "type": "tool_use",
    "index": 1,
    "partial_json": "{\"task_id\": \"b55a35af-b676-4501-ab02-08396e00bf4a\"}"
  }
],
"additional_kwargs": {

},
"response_metadata": {
  "stop_reason": "tool_use",
  "stop_sequence": null
},
"type": "ai",
"name": null,
"id": "run-fb939550-7da2-4437-8550-862f386dca07",
"example": false,
"tool_calls": [
  {
    "name": "get_task",
    "args": {
      "task_id": "b55a35af-b676-4501-ab02-08396e00bf4a"
    },
    "id": "toolu_01GExmK6qCiDQLv5HrHwFQ8x",
    "type": "tool_call"
  }
],
"invalid_tool_calls": [],
"usage_metadata": {
  "input_tokens": 3053,
  "output_tokens": 113,
  "total_tokens": 3166,
  "input_token_details": {
    "cache_creation": 0,
    "cache_read": 0
  }
}

},
{
"content": "{"id": "b55a35af-b676-4501-ab02-08396e00bf4a", .... CONTENT TRUNCATED, JSON IS VALID ....}",
"additional_kwargs": {

},
"response_metadata": {

},
"type": "tool",
"name": "get_task",
"id": "9a85944e-cf1d-43ab-9cd1-36217ce28f2d",
"tool_call_id": "toolu_01GExmK6qCiDQLv5HrHwFQ8x",
"artifact": null,
"status": "success"

}

The tool invocation ids seem to match, however, I am still getting the invalid history error.

Thank you.