ai agent mysql tool cannot pass dymanic values using {{$fromAI()}}

[jithinagiboson]

Bug Description

i was trying to execute sql query which is dynamicaly populated by the ai agent
the table name is clearly generated by the ai and it is very visible on the expression output.But when i run it i shows no execution data available. i think its a bug.
i am using version 1.62.3

To Reproduce

just try to pass a dynamic value from ai to the query section

Expected behavior

the qury should have worked using the dynamic value which in my case was table name

Operating System

Linux Mint 21

n8n Version

1.62.3

Node.js Version

v20.10.0

Database

MySQL

Execution mode

main (default)

[Joffcom]

Hey @jithinagiboson,

We have created an internal ticket to look into this which we will be tracking as "GHC-304"

[Joffcom]

Hey @jithinagiboson,

Can you expand the error details? Looking at that I suspect one of your 9 inputs doesn't have valid output data, Have you checked all 9?

[jithinagiboson]

all 9 have this same value as the previous image

[jithinagiboson]

if i put the query static it works. But i want to select the table name dynamicaly from table list and call describe on that table name

[jithinagiboson]

am trying to create a text to sql chat bot

[Joffcom]

@jithinagiboson can you share the full output from the error so we can take a look? no execution data sounds like one of the 9 runs may not be returning anything.

[jithinagiboson]

No execution data available
Error details

 Other info
n8n version

1.62.3 (Self Hosted)

Time

10/10/2024, 6:55:41 PM

Error cause

{ "message": "No execution data available", "timestamp": 1728566741499, "name": "ExpressionError", "context": { "type": "no_execution_data" } }```

[Joffcom]

Perfect and what is the output of the model and are you using one that is smart enough to know that there are multiple tools that may need to be used?

[jithinagiboson]

i am using qwen2.5 14b its very inteligent than llama3.1 for this stuff

[jithinagiboson]

this name is passed from the ai agent if my knowledge is correct i did not pass that value mannualy

[jithinagiboson]

My_workflow (2).json
i donot know if this file is use full

[Joffcom]

Do you have the output of the model? I can see the input on the tool which could be different to the output of the model

[jithinagiboson]

this one ?

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                "additional_kwargs": {},
                "id": "run-d05e0087-1056-4dd8-9b43-13501bb60ade"
              }
            }
          ]
        },
        "observation": "Error during node execution: undefined"
      }
    ]
  }
]```

[jithinagiboson]

change ollama chat model format to JSON now output is shorter but same issue

  "output": "{}\n",
  "intermediateSteps": [
    {
      "action": {
        "tool": "describe_table",
        "toolInput": {
          "name": "payment_payments"
        },
        "toolCallId": "f445664a-88fa-44ac-b78d-5eb018d7c3ca",
        "log": "Invoking \"describe_table\" with {\"name\":\"payment_payments\"}\n",
        "messageLog": [
          {
            "lc": 1,
            "type": "constructor",
            "id": [
              "langchain_core",
              "messages",
              "AIMessageChunk"
            ],
            "kwargs": {
              "content": "",
              "tool_call_chunks": [
                {
                  "name": "describe_table",
                  "args": "{\"name\":\"payment_payments\"}",
                  "type": "tool_call_chunk",
                  "index": 0,
                  "id": "f445664a-88fa-44ac-b78d-5eb018d7c3ca"
                }
              ],
              "response_metadata": {
                "model": "qwen2.5:14b",
                "created_at": "2024-10-10T13:54:46.799672667Z",
                "done_reason": "stop",
                "done": true,
                "total_duration": 1039176216,
                "load_duration": 53838797,
                "prompt_eval_count": 369,
                "prompt_eval_duration": 100018000,
                "eval_count": 26,
                "eval_duration": 726747000
              },
              "usage_metadata": {
                "input_tokens": 369,
                "output_tokens": 26,
                "total_tokens": 395
              },
              "tool_calls": [
                {
                  "name": "describe_table",
                  "args": {
                    "name": "payment_payments"
                  },
                  "id": "f445664a-88fa-44ac-b78d-5eb018d7c3ca",
                  "type": "tool_call"
                }
              ],
              "invalid_tool_calls": [],
              "additional_kwargs": {},
              "id": "run-5cb22832-5424-40fb-a120-e53b89b0fee6"
            }
          }
        ]
      },
      "observation": "Error during node execution: undefined"
    }
  ]
}