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# Update form field

> Change the label or the instructions of a field. Input schema, a tools/call example and an example result.

Source: https://cotlet.dev/docs/mcp/123formbuilder/update_form_field

Docs sections: [Get started](https://cotlet.dev/docs.md) · [REST API](https://cotlet.dev/docs/api.md) · [MCP](https://cotlet.dev/docs/mcp.md) · [SDKs & CLI](https://cotlet.dev/docs/sdks.md) · [Integrations](https://cotlet.dev/docs/integrations.md)

Change the label or the instructions of a field.

123FormBuilder MCP tools: https://cotlet.dev/docs/mcp/123formbuilder.md

MCP tool: `123formbuilder_write → update_form_field`

Access: write. Confirm: waits for the user's OK before it runs.

Selects a field by its label and changes its label or the text in the Instructions box under Quick setup. Fields you do not name stay as they are. Answers already collected keep working. A form embedded with the JavaScript code shows the change as soon as it is saved. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `form_id` | integer | yes | Form id from list_forms. |
| `field` | string | yes | Current label of the field, from get_form. |
| `label` | string | no | New label. |
| `instructions` | string | no | New text for the Instructions box. |

## tools/call

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "123formbuilder_write",
    "arguments": {
      "operation": "update_form_field",
      "arguments": {
        "form_id": 1,
        "field": "field"
      }
    }
  }
}
```

## Example response

```json
{
  "content": [
    {
      "type": "text",
      "text": "{ ... same JSON as structuredContent ... }"
    }
  ],
  "structuredContent": {
    "form_id": 5130021,
    "field": {
      "label": "Phone",
      "type": "Phone",
      "instructions": "Include the country code"
    }
  },
  "isError": false
}
```

Previous: [Add form field](https://cotlet.dev/docs/mcp/123formbuilder/add_form_field.md)
Next: [Activate or deactivate form](https://cotlet.dev/docs/mcp/123formbuilder/set_form_active.md)

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