Troubleshooting AI Tool Input for Google Sheets Append Row: "Received tool input did not match expected schema"

I'm developing a workflow with callin.io Cloud (v1.89.2) and encountering an error when attempting to add a new row to Google Sheets through an AI tool call:

Received tool input did not match expected schema

The step that's failing is an Append Row action, utilizing the create_new_order tool connected to Google Sheets.

---

Context:

The system prompt section (tool definition) is configured as follows:

{
  "name": "create_new_order",
  "description": "Registers a new order in the 'Orders' sheet. If pairs_no ≥ 4, free pickup is activated.",
  "parameters": {
    "type": "object",
    "properties": {
      "Status": {
        "type": "string",
        "description": "Initial order status, default is Received"
      },
      "user_id": {
        "type": "string",
        "description": "Unique user identifier",
        "memory": "user_id"
      },
      "user_name": {
        "type": "string",
        "description": "Customer's full name",
        "memory": "name"
      },
      "address": {
        "type": "string",
        "description": "Pickup/delivery address",
        "memory": "address"
      },
      "zip": {
        "type": "string",
        "description": "Postal code",
        "memory": "zip"
      },
      "phone": {
        "type": "string",
        "description": "Customer's phone number",
        "memory": "phone"
      },
      "pairs_no": {
        "type": "string",
        "description": "Total number of shoe pairs",
        "memory": "num_pairs"
      },
      "unit_price": {
        "type": "string",
        "description": "Price per pair of shoes",
        "memory": "price"
      },
      "total_price": {
        "type": "string",
        "description": "Total order price (pairs_no * unit_price)",
        "memory": "price"
      }
    },
    "required": ["Status","user_id","user_name","address","zip","phone","pairs_no","unit_price","total_price"]
  }
}

---

Google Sheets step setup:

The create_new_order step is set up as follows (Mapping Column Mode: manual):

Values to Send:

• status {{ $fromAI("status") }}
• userid {{ $fromAI("userid") }}
• username {{ $fromAI("username") }}
• address {{ $fromAI("address") }}
• zip {{ $fromAI("zip") }}
• phone {{ $fromAI("phone") }}
• pairsno {{ $fromAI("pairsno") }}
• unitprice {{ $fromAI("unitprice") }}
• totalprice {{ $fromAI("totalprice") }}

---

What I’ve tried:

• Verified that all parameter names align with the schema.
• All values are being passed using fromAI(), for example: {{ $fromAI("status") }}.
• Attempted to hardcode a single value, but the result remained the same.
• Experimented by changing Status to status (lowercase) in both the schema and the user interface, but the issue persists.

---

Running:

callin.io Cloud
Version: 1.89.2
AI Step Version: v4.1 mini

Question:

What could be causing this tool input schema mismatch? Any guidance or suggestions would be greatly appreciated.