SharePoint Agents AMA

Once the agents are deployed to the tenant, what will the user experience be when logging into the SharePoint site? Could you provide screenshots or a link detailing the complete user experience, including any notifications, popup windows, and buttons added to the site? We need to understand how this will affect our site UI customizations. Additionally, according to the articles, a popup is shown when a user logs in for the first time after the rollout. Will this popup appear only once per user per tenant, or will it appear every time the user logs into different SharePoint sites?