I don’t know if this was silently added or if I just missed the memo, but Tempest is now working with Google’s App Actions that replaced the Conversation Actions platform. “Ok Google, Show me the weather using Tempest” now launches the Tempest app on your phone and shows you a weather tile with your current temperature, sky conditions, and forecast.
Unfortunately, since you can’t install apps on the Google Home devices, this doesn’t work with them, but at least it’s a step forward with what Google allows.