# Update Agent Variable

PATCH https://api.deepgram.com/v1/projects//agent-variables/
Content-Type: application/json

Updates the value of an existing template variable

Reference: https://developers.deepgram.com/reference/voice-agent/agent-variables/update-agent-variable

## Authentication

- `Authorization` header (required) (prefixed with `Token `) — Use `Authorization: Token <API_KEY>` Example: `Authorization: Token 12345abcdef`

## Request

### Path parameters

- `project_id` (string, required) — The unique identifier of the project
- `variable_id` (string, required) — The unique identifier of the agent variable

### Body (application/json)

This endpoint expects an UpdateAgentVariableV1Request.

- `value` (any, required) — The new value to substitute

## Response

### 200

Agent variable updated

- `variable_id` (string, required) — The unique identifier of the variable
- `key` (string, required) — The variable name, following the DG\_\<VARIABLE\_NAME> format
- `value` (any, required) — The value to substitute. Can be any valid JSON type
- `created_at` (string, optional) — Timestamp when the variable was created
- `updated_at` (string, optional) — Timestamp when the variable was last updated

## Errors

### 400 Bad Request Error

Invalid Request

- `ErrorResponse`

## Types

### ErrorResponseLegacyError

- `err_code` (string, optional) — The error code
- `err_msg` (string, optional) — The error message
- `request_id` (string, optional) — The request ID

### ErrorResponseModernError

- `category` (string, optional) — The category of the error
- `message` (string, optional) — A message about the error
- `details` (string, optional) — A description of the error
- `request_id` (string, optional) — The unique identifier of the request

## Examples

**Request**

```json
"Welcome to the Deepgram transcription service!"
```

**Response**

```json
{
  "variable_id": "v1a2b3c4-d5e6-7890-abcd-ef1234567890",
  "key": "welcome_message",
  "value": "Welcome to the Deepgram transcription service!",
  "created_at": "2024-01-15T09:30:00Z",
  "updated_at": "2024-01-15T09:30:00Z"
}
```

**SDK Code**

```python
import requests

url = "https://api.deepgram.com/v1/projects/123456-7890-1234-5678-901234/agent-variables/v1a2b3c4-d5e6-7890-abcd-ef1234567890"

payload = "Welcome to the Deepgram transcription service!"
headers = {
    "Authorization": "Token <apiKey>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript
const url = 'https://api.deepgram.com/v1/projects/123456-7890-1234-5678-901234/agent-variables/v1a2b3c4-d5e6-7890-abcd-ef1234567890';
const options = {
  method: 'PATCH',
  headers: {Authorization: 'Token <apiKey>', 'Content-Type': 'application/json'},
  body: '"Welcome to the Deepgram transcription service!"'
};

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.deepgram.com/v1/projects/123456-7890-1234-5678-901234/agent-variables/v1a2b3c4-d5e6-7890-abcd-ef1234567890"

	payload := strings.NewReader("\"Welcome to the Deepgram transcription service!\"")

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

	req.Header.Add("Authorization", "Token <apiKey>")
	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.deepgram.com/v1/projects/123456-7890-1234-5678-901234/agent-variables/v1a2b3c4-d5e6-7890-abcd-ef1234567890")

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

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Token <apiKey>'
request["Content-Type"] = 'application/json'
request.body = "\"Welcome to the Deepgram transcription service!\""

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.deepgram.com/v1/projects/123456-7890-1234-5678-901234/agent-variables/v1a2b3c4-d5e6-7890-abcd-ef1234567890")
  .header("Authorization", "Token <apiKey>")
  .header("Content-Type", "application/json")
  .body("\"Welcome to the Deepgram transcription service!\"")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('PATCH', 'https://api.deepgram.com/v1/projects/123456-7890-1234-5678-901234/agent-variables/v1a2b3c4-d5e6-7890-abcd-ef1234567890', [
  'body' => '"Welcome to the Deepgram transcription service!"',
  'headers' => [
    'Authorization' => 'Token <apiKey>',
    'Content-Type' => 'application/json',
  ],
]);

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

```csharp
using RestSharp;

var client = new RestClient("https://api.deepgram.com/v1/projects/123456-7890-1234-5678-901234/agent-variables/v1a2b3c4-d5e6-7890-abcd-ef1234567890");
var request = new RestRequest(Method.PATCH);
request.AddHeader("Authorization", "Token <apiKey>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "\"Welcome to the Deepgram transcription service!\"", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Token <apiKey>",
  "Content-Type": "application/json"
]
let parameters = "Welcome to the Deepgram transcription service!" as [String : Any]

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

let request = NSMutableURLRequest(url: NSURL(string: "https://api.deepgram.com/v1/projects/123456-7890-1234-5678-901234/agent-variables/v1a2b3c4-d5e6-7890-abcd-ef1234567890")! 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()
```

## Related pages

- [Create Agent Variable](./self-hosted-deployments-2-reference-voice-agent-agent-variables-create-agent-variable.md)
- [List Agent Variables](./self-hosted-deployments-2-reference-voice-agent-agent-variables-list-agent-variables.md)
- [Get Agent Variable](./self-hosted-deployments-2-reference-voice-agent-agent-variables-get-agent-variable.md)
- [Delete Agent Variable](./self-hosted-deployments-2-reference-voice-agent-agent-variables-delete-agent-variable.md)

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