# Create an Agent Variable

**POST** `/v1/projects/{project_id}/agent-variables`

Creates a new template variable. Variables follow the `DG_<VARIABLE_NAME>` naming format and can substitute any JSON value in an agent configuration.

Base URL: `https://agent.deepgram.com`

Tags: `variables`

## Authorization

| Option | Scheme | Type | Sent as | Scopes |
| --- | --- | --- | --- | --- |
| Option 1 | `ApiKeyAuth` | `apiKey` | header `Authorization` | — |

## Path parameters

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `project_id` | `string` | Yes | The unique identifier of the project |

## Request body

Optional. Media type: `application/json`

Agent variable details

### Example request body

```json
{
  "api_version": 1,
  "key": "string",
  "value": null
}
```

## Responses

| Status | Description | Media type |
| --- | --- | --- |
| `200` | Agent variable created successfully | `application/json` |
| `400` | Invalid Request | `application/json` |

### Example response: 200 — Agent variable created successfully

```json
{
  "created_at": "2026-06-09T00:00:00Z",
  "key": "string",
  "updated_at": "2026-06-09T00:00:00Z",
  "value": null,
  "variable_id": "string"
}
```

### Example response: 400 — Invalid Request

```json
{
  "err_code": "string",
  "err_msg": "string",
  "request_id": "string"
}
```

## Related pages

- [Analyze text content](./text_analyze.md)
- [audio](./tags/audio.md)
- [balances](./tags/balances.md)
- [breakdown](./tags/breakdown.md)
- [configurations](./tags/configurations.md)
- [Create a Project Invite](./invites_create.md)
- [Create a Project Key](./keys_create.md)
- [Create a Project Self-Hosted Distribution Credential](./distributioncredentials_create.md)
- [Create an Agent Configuration](./configurations_create.md)
- [Delete a Project](./projects_delete.md)

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