Google Assistant

The Google Assistant has a new development platform with a built-in conversation builder. This new platform does not integrate with Dialogflow. It is recommended for new Google Assistant development to use the new platform. See Conversational Actions.

If you are maintaining a legacy integration, it is not deprecated, and it will continue to function. See Dialogflow and legacy Actions SDK. You can also see the June 2020 snapshot of the Google Assistant legacy integration documentation.