- Using `@action` annotation to indicate methods that are allowed to be
executed as actions
- The output and errors of an action are automatically wrapped into a
`Response` object without any response build required on the plugin side
prevents a PortAudio write on input-only stream error in the Assistant
SDK, see https://github.com/googlesamples/assistant-sdk-python/issues/185
- Make sure that user_request is always defined before returning it
- Use assistant.google.pushtotalk as a fallback if assistant.google is
not configured/available
