This application requires granting
access to your Google identity & email address (just to show in the log file under which account you have executed the script - in case it would be necessary to trace the issue. This information is NOT accessible to the developer and is NOT stored anywhere.)
access (view/manage) to your tasks (well, this is what you want it to do, right?)
access to your data related to this script/app (so it can store your preferences)
execution without you being present (so it can run automatically every hour)