code: public function layoutUpdatesAction()
      {
          $token = $this->getRequest()->getParam('token');
          if (!$token) {
              return $this->getResponse()->setHttpResponseCode(400)->setBody('Invalid parameters');
          }
  
          /** @var Sheep_Debug_Model_RequestInfo $requestProfile */
          $requestProfile = Mage::getModel('sheep_debug/requestInfo')->load($token, 'token');
          if (!$requestProfile->getId()) {
              return $this->getResponse()->setHttpResponseCode(404)->setBody('Request profile not found');
          }
  
          $layoutUpdates = $requestProfile->getDesign()->getLayoutUpdates();
          $this->renderArray($layoutUpdates, 'No Data', array('#', 'XML'));
      }
docs: Returns layout handles for specified request profile