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# Media · Generate · Discover generation model field schema (step 1 of 3)

GET https://api.simplified.com/api/v1/ai-imageart/model-fields

Step 1 — discover the dynamic per-(model, capability) parameter
schema before calling `generateVideo`. Not needed for `generateImage`,
which takes one fixed contract for every model. A single
unified endpoint serves both image and video engines, selected by
the required `type` query param.

Response modes (driven by which query params you pass):

* `type` only → `{models: [...]}` — list every registered engine of
  that type, its capabilities, and metadata (incl. `credits_per_image`
  / `estimated_time`). Use this to pick a `model_id`.
* `type` + `model_id` → single-model detail with capabilities map.
* `type` + `model_id` + `capability` → the full FieldDescriptor
  schema for that (model, capability) pair (labels, field\_type,
  required flags, enum\_values, defaults). This is the contract that
  `generateImage` / `generateVideo`'s `parameters` must match.

Use this before generating — it eliminates 400 errors on invalid /
missing parameter keys.

Reference: https://docs.simplified.com/api-reference/platform/ai-generation/get-model-fields

## Authentication

- `Authorization` header (required) (prefixed with ` Api-Key   `) — Header authentication of the form `Api-Key  <token>`
- `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer <token>`, where token is your auth token.

## Request

### Query parameters

- `type` (enum, required) — Engine type to introspect.
  - Allowed values: `video`, `image`
- `model_id` (string, optional) — Engine id (e.g. `KLING_VIDEO_PRO`). Omit to list all engines of `type`.
- `capability` (enum, optional) — Capability — required to receive the per-(model, capability) field schema; otherwise you get the model's capability map.
  - Allowed values: `prompt`, `reference_image`, `multiple_images`, `first_last_frame`, `video_to_video`

## Response

### 200

Shape depends on which query params are present — see operation description. Always JSON.

- `any`

## Errors

### 400 Bad Request Error

Missing required `type` or invalid `capability`.

- `any`

### 401 Unauthorized Error

Unauthorized.

- `any`

## Examples

**SDK Code**

```python
import requests

url = "https://api.simplified.com/api/v1/ai-imageart/model-fields"

querystring = {"type":"video"}

headers = {"Authorization": "Api-Key  <apiKey>"}

response = requests.get(url, headers=headers, params=querystring)

print(response.json())
```

```javascript
const url = 'https://api.simplified.com/api/v1/ai-imageart/model-fields?type=video';
const options = {method: 'GET', headers: {Authorization: 'Api-Key  <apiKey>'}};

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"
	"net/http"
	"io"
)

func main() {

	url := "https://api.simplified.com/api/v1/ai-imageart/model-fields?type=video"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Api-Key  <apiKey>")

	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.simplified.com/api/v1/ai-imageart/model-fields?type=video")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Api-Key  <apiKey>'

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.get("https://api.simplified.com/api/v1/ai-imageart/model-fields?type=video")
  .header("Authorization", "Api-Key  <apiKey>")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('GET', 'https://api.simplified.com/api/v1/ai-imageart/model-fields?type=video', [
  'headers' => [
    'Authorization' => 'Api-Key  <apiKey>',
  ],
]);

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

```csharp
using RestSharp;

var client = new RestClient("https://api.simplified.com/api/v1/ai-imageart/model-fields?type=video");
var request = new RestRequest(Method.GET);
request.AddHeader("Authorization", "Api-Key  <apiKey>");
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = ["Authorization": "Api-Key  <apiKey>"]

let request = NSMutableURLRequest(url: NSURL(string: "https://api.simplified.com/api/v1/ai-imageart/model-fields?type=video")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers

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()
```