Can the AI assistants read your site?
Before anything else matters, the crawlers have to be able to reach you. Most robots.txt files were written for Google years before these agents existed, and quietly turn them away.
Why this is worth checking first
A business can rewrite its content forever and stay invisible if the crawlers are blocked at the door. It is the one problem on this site with a definite answer and a definite fix.
Not the same question as whether you actually appear in answers. The visibility check asks a live assistant about your sector and tells you whether your name comes back.