yes it is defined as required @Vignxt Flow

{
  "id": "4b6a1235-361f-4ba8-bdf0-dda167fb26c4",
  "createdAt": "2025-09-01T17:09:43.506Z",
  "updatedAt": "2025-09-03T13:39:38.097Z",
  "type": "apiRequest",
  "function": {
    "name": "api_request_tool",
    "description": "The unique loadnumber (string of digits) that identifies the shipment. This must always be provided from user input and cannot be empty."
  },
  "messages": [
    {
      "type": "request-start",
      "blocking": false
    }
  ],
  "orgId": "{ORG_ID}",
  "name": "getShipmentDetail",
  "url": "{URL}",
  "method": "POST",
  "headers": {
    "type": "object",
    "properties": {
      "ngrok-skip-browser-warning": {
        "type": "string",
        "value": "'true'"
      }
    }
  },
  "body": {
    "type": "object",
    "required": [
      "loadnumber"
    ],
    "properties": {
      "loadnumber": {
        "description": "This loadnumber must be passed when the tool call is made. Never ever used ",
        "type": "string",
        "default": "49210"
      }
    }
  },
  "variableExtractionPlan": {
    "schema": {
      "type": "object",
      "required": [],
      "properties": {}
    },
    "aliases": []
  }
}

I have removed a few information for security reasons Rest you can have a look at this tool config