## Add Session Resource

`$client->beta->sessions->resources->add(string sessionID, string fileID, Type type, ?string mountPath, ?list<AnthropicBeta> betas): ManagedAgentsFileResource`

**post** `/v1/sessions/{session_id}/resources`

Add Session Resource

### Parameters

- `sessionID: string`

- `fileID: string`

  ID of a previously uploaded file.

- `type: Type`

- `mountPath?:optional string`

  Mount path in the container. Defaults to `/mnt/session/uploads/<file_id>`.

- `betas?:optional list<AnthropicBeta>`

  Optional header to specify the beta version(s) you want to use.

### Returns

- `ManagedAgentsFileResource`

  - `string id`

  - `\Datetime createdAt`

    A timestamp in RFC 3339 format

  - `string fileID`

  - `string mountPath`

  - `Type type`

  - `\Datetime updatedAt`

    A timestamp in RFC 3339 format

### Example

```php
<?php

require_once dirname(__DIR__) . '/vendor/autoload.php';

$client = new Client(apiKey: 'my-anthropic-api-key');

$betaManagedAgentsFileResource = $client->beta->sessions->resources->add(
  'sesn_011CZkZAtmR3yMPDzynEDxu7',
  fileID: 'file_011CNha8iCJcU1wXNR6q4V8w',
  type: 'file',
  mountPath: '/uploads/receipt.pdf',
  betas: ['message-batches-2024-09-24'],
);

var_dump($betaManagedAgentsFileResource);
```

#### Response

```json
{
  "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht",
  "created_at": "2026-03-15T10:00:00Z",
  "file_id": "file_011CNha8iCJcU1wXNR6q4V8w",
  "mount_path": "/uploads/receipt.pdf",
  "type": "file",
  "updated_at": "2026-03-15T10:00:00Z"
}
```