private function addBuiltInCommandsAndHooks() {
    $commands = $this->getCommands([
      'path' => __DIR__ . '/Commands',
      'namespace' => 'Acquia\Blt\Robo\Commands',
    ]);
    $hooks = $this->getHooks([
      'path' => __DIR__ . '/Hooks',
      'namespace' => 'Acquia\Blt\Robo\Hooks',
    ]);
    $this->commands = array_merge($commands, $hooks);
  }