Proper way to inject Session data before model save/validate in CakePHP 1.3?
if (!empty($this->data)) {
    $this->Model->create();
    $this->data['Model']['agent_id'] = $this->Auth->user('id');
    if ($this->Model->save($this->data)) {
         // success
    }
}

// in your Model.php
App::import('Model', 'CakeSession');
$session = new CakeSession();