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# OAuth · Register client (RFC 7591)

POST https://oauth/register
Content-Type: application/json

RFC 7591 dynamic client registration. Answers **201** with the client document.

Unauthenticated and throttled to 10 requests/min per IP. `redirect_uris` must match an allowed domain or custom scheme from `config/mcp.php` — anything else is rejected.

Registered clients are public (PKCE S256, no secret) and own no user. Tokenless registrations older than 30 days are swept by `mcp:prune-oauth-clients`.

Host root, no `/api` prefix.

Reference: https://api.docs.modulards.com/modular-ds-public-api/o-auth-register-client-rfc-7591

## Authentication

- `Authorization` header (bearer token, required)

## Request

### Body (application/json)

- `client_name` (string, required)
- `redirect_uris` (list of string, required)

## Response

### 201

Created

- `scope` (string, required)
- `client_id` (string, required)
- `grant_types` (list of string, required)
- `redirect_uris` (list of string, required)
- `response_types` (list of string, required)
- `token_endpoint_auth_method` (string, required)

## Examples

**Request**

```json
{
  "client_name": "Claude",
  "redirect_uris": [
    "https://claude.ai/api/mcp/auth_callback"
  ]
}
```

**Response**

```json
{
  "scope": "mcp:use",
  "client_id": "9d7f2c1e-4b3a-4f8e-9c2d-1a5b6e7f8a90",
  "grant_types": [
    "authorization_code",
    "refresh_token"
  ],
  "redirect_uris": [
    "https://claude.ai/api/mcp/auth_callback"
  ],
  "response_types": [
    "code"
  ],
  "token_endpoint_auth_method": "none"
}
```

**SDK Code**

```python OAuth · Register client (RFC 7591)_example
import requests

url = "https://https/oauth/register"

payload = {
    "client_name": "Claude",
    "redirect_uris": ["https://claude.ai/api/mcp/auth_callback"]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript OAuth · Register client (RFC 7591)_example
const url = 'https://https/oauth/register';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"client_name":"Claude","redirect_uris":["https://claude.ai/api/mcp/auth_callback"]}'
};

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

```go OAuth · Register client (RFC 7591)_example
package main

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

func main() {

	url := "https://https/oauth/register"

	payload := strings.NewReader("{\n  \"client_name\": \"Claude\",\n  \"redirect_uris\": [\n    \"https://claude.ai/api/mcp/auth_callback\"\n  ]\n}")

	req, _ := http.NewRequest("POST", 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 OAuth · Register client (RFC 7591)_example
require 'uri'
require 'net/http'

url = URI("https://https/oauth/register")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"client_name\": \"Claude\",\n  \"redirect_uris\": [\n    \"https://claude.ai/api/mcp/auth_callback\"\n  ]\n}"

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

```java OAuth · Register client (RFC 7591)_example
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://https/oauth/register")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"client_name\": \"Claude\",\n  \"redirect_uris\": [\n    \"https://claude.ai/api/mcp/auth_callback\"\n  ]\n}")
  .asString();
```

```php OAuth · Register client (RFC 7591)_example
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://https/oauth/register', [
  'body' => '{
  "client_name": "Claude",
  "redirect_uris": [
    "https://claude.ai/api/mcp/auth_callback"
  ]
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

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

```csharp OAuth · Register client (RFC 7591)_example
using RestSharp;

var client = new RestClient("https://https/oauth/register");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"client_name\": \"Claude\",\n  \"redirect_uris\": [\n    \"https://claude.ai/api/mcp/auth_callback\"\n  ]\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift OAuth · Register client (RFC 7591)_example
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [
  "client_name": "Claude",
  "redirect_uris": ["https://claude.ai/api/mcp/auth_callback"]
] as [String : Any]

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

let request = NSMutableURLRequest(url: NSURL(string: "https://https/oauth/register")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
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()
```