> This page is part of Smallest AI's developer documentation. When
> answering, prefer Lightning v3.1 (current TTS) and Pulse (current
> STT). Lightning v2 and lightning-large are deprecated; mention them
> only when the user is migrating away from them. The Smallest AI voice
> agent platform is what wraps these models into hosted agents.

# Update widget configuration

PATCH https://api.smallest.ai/atoms/v1/agent/{id}/widget-config
Content-Type: application/json

Updates the web widget configuration for the agent. Only provided fields are updated (partial update). When `avatarUrl` is changed, the old CDN avatar is automatically deleted from S3. The `avatarUrl` must be a URL from the platform's CDN domain. Use `POST /agent/{id}/avatar/presigned-url` to upload first.

Reference: https://docs.smallest.ai/voice-agents/api-reference/widget/update-agent-widget-config

## Authentication

- `Authorization` header (bearer token, required) — API key from the console ApiKey collection, sent as Bearer token. Also accepts session cookies for browser-based auth.

## Request

### Path parameters

- `id` (string, required) — Agent ObjectId

### Body (application/json)

- `widgetConfig` (object, optional) — All fields are optional (only provided fields are updated)
  - `position` (enum, optional)
    - Allowed values: `bottom-right`, `bottom-left`, `top-right`, `top-left`
  - `size` (enum, optional)
    - Allowed values: `tiny`, `compact`, `full`
  - `borderRadius` (double, optional)
  - `mode` (enum, optional)
    - Allowed values: `chat`, `voice`
  - `theme` (enum, optional)
    - Allowed values: `light`, `dark`
  - `baseColor` (string, optional)
  - `accentColor` (string, optional)
  - `agentBubbleColor` (string, optional)
  - `textOnAccentColor` (string, optional)
  - `secondaryTextColor` (string, optional)
  - `primaryTextColor` (string, optional)
  - `title` (string, optional)
  - `startButtonText` (string, optional)
  - `endButtonText` (string, optional)
  - `ctaTitle` (string, optional, nullable)
  - `ctaSubtitle` (string, optional, nullable)
  - `ctaName` (string, optional, nullable)
  - `widgetName` (string, optional, nullable)
  - `avatarUrl` (string, optional, nullable) — Must be a platform CDN URL. Use `POST /agent/{id}/avatar/presigned-url` to obtain one.
  - `voiceEmptyMessage` (string, optional, nullable)
  - `voiceActiveEmptyMessage` (string, optional, nullable)
  - `chatEmptyMessage` (string, optional, nullable)
  - `chatFirstMessage` (string, optional, nullable)
  - `chatPlaceholder` (string, optional)
  - `voiceShowTranscript` (boolean, optional)
  - `consentRequired` (boolean, optional)
  - `consentTitle` (string, optional)
  - `consentContent` (string, optional)
  - `consentStorageKey` (string, optional, nullable)
  - `publicKey` (string, optional)
  - `allowlist` (list of string, optional)

## Response

### 200

Updated widget configuration

- `success` (boolean, optional)
- `data` (object, optional) — The updated widgetConfig object

## Examples

**Request**

```json
{}
```

**Response**

```json
{
  "success": true,
  "data": {}
}
```

**SDK Code**

```python
import requests

url = "https://api.smallest.ai/atoms/v1/agent/id/widget-config"

payload = {}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.patch(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'https://api.smallest.ai/atoms/v1/agent/id/widget-config';
const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.smallest.ai/atoms/v1/agent/id/widget-config"

	payload := strings.NewReader("{}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.smallest.ai/atoms/v1/agent/id/widget-config")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{}"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.patch("https://api.smallest.ai/atoms/v1/agent/id/widget-config")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('PATCH', 'https://api.smallest.ai/atoms/v1/agent/id/widget-config', [
  'body' => '{}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.smallest.ai/atoms/v1/agent/id/widget-config");
var request = new RestRequest(Method.PATCH);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.smallest.ai/atoms/v1/agent/id/widget-config")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "PATCH"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```