The app works with your Skilltage account and permissions, in the organisations you belong to. It cannot see anything you could not see yourself.
Every tool is labelled as reading, adding or changing data. Tools that change or delete data or email candidates are marked so your AI app can ask you before it runs them; how it asks depends on the app and its settings.
An AI app is another way to use Skilltage, not a decision-maker. The recruiter who connected it remains responsible for the stages, statuses and emails it changes, just as in the Skilltage app, and Skilltage records each recruitment action as taken through a connected app.