Jeff is a private personal assistant used only by its owner.
When its owner connects their Google account, Jeff reads their Google Calendar and Gmail, changes calendar events and writes Gmail drafts, only to help that owner. It cannot send email.
Jeff runs on its owner's own computer, and its Google sign-in is kept in that computer's keychain. Jeff does not sell, share or transfer Google user data to anyone, and does not use it for advertising.
Jeff's use of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements.
The owner can remove Jeff's access at any time at myaccount.google.com/connections.