MCP tool call with Object type parameter does not work

[inv-Eldho]

What happened?

@danny-avila

Ongoing Issue with add_fields Tool – Properties Being Passed as Empty

Hi,

We are experiencing the same issue again when attempting to pass field properties from LibreChat to MCP. The properties object becomes empty during the process, specifically when using the add_fields tool.

Prompt i tried is :
Add these field into app

{
"app": 810,
"properties": {
type: "SINGLE_LINE_TEXT"
code: "minutes_id",
label: "minutes_id" }
}
}
Here’s the request we’re making:

Running add_fields tool

{
"app_id": 810,
"properties": {
"minutes_id": {
"code": "minutes_id",
"type": "SINGLE_LINE_TEXT",
"label": "minutes_id",
"required": false
}
}
}
Result:
We continue to encounter a technical issue when trying to add the minutes_id field to the app. The system returns the following error:

"properties requires at least one field definition"

Already reported this issue, on but we can't pass the parameters to mcp server

#6713
Thank you.

Version Information

f4d97e1

Steps to Reproduce

1. Add these field into app

{
"app": 810,
"properties": {
type: "SINGLE_LINE_TEXT"
code: "minutes_id",
label: "minutes_id" }
}
}
Here’s the request we’re making:

Running add_fields tool

{
"app_id": 810,
"properties": {
"minutes_id": {
"code": "minutes_id",
"type": "SINGLE_LINE_TEXT",
"label": "minutes_id",
"required": false
}
}
}
Result:
We continue to encounter a technical issue when trying to add the minutes_id field to the app. The system returns the following error:

"properties requires at least one field definition"

What browsers are you seeing the problem on?

No response

Relevant log output

None

Screenshots

None

Code of Conduct

• I agree to follow this project's Code of Conduct

[danny-avila]

There's not enough information here to help reproduce the issue.

Can you share the MCP Server or a minimum reproduction? Also, which AI providers/models are you using?

[inv-Eldho]

@danny-avila

Sorry for not providing detailed steps to reproduce in the previous description.

Using the model apac.anthropic.claude-3-7-sonnet-20250219-v1:0.

I'm using the MCP server for Kintone (dev), specifically the kintone-mcp-server.

My workflow is:
Prompt: Create an app named "Project Tracking"
Executed tool: create_app()
Prompt: Create a record in the app that contains a drop-down list field.
Executed tool: add_fields()

After that, the add_fields() tool was run again with the following input:

{
  "app_id": 820,
  "properties": {
    "status": {
      "type": "DROP_DOWN",
      "code": "status",
      "label": "Status",
      "options": {
        "Not Started": {
          "label": "Not Started",
          "index": "0"
        },
        "In Progress": {
          "label": "In Progress",
          "index": "1"
        }
      }
    }
  }
}

Issue:
The error I receive is:

properties には少なくとも1つのフィールド定義を指定する必要があります。
Translation: "You must specify at least one field definition in properties."

We also tested the latest changes in this merge request, but it does not fix the issue.

Thank you for understanding !

[inv-Eldho]

@danny-avila

Could you please give an update for this ?

Thank You !