does this help?

Author: stephenplusplus

lib/common/grpc-service.js

@@ -137,6 +137,10 @@ var HTTP_ERROR_CODE_MAP = {
  * @param {object} options - [Configuration object](#/docs/?method=gcloud).
  */
 function GrpcService(config, options) {
+  if (global.GCLOUD_SANDBOX_ENV) {
+    return;
+  }
+
   Service.call(this, config, options);
 
   var service = config.service;