Information about tools in a grid – Exchange of user experience stack

OK, then there is a grid. And a customer who wants information about tools in that grid. To show 13 additional columns (I'm not kidding), and few rows.

Please confirm that the tooltip information usually shows a sentence. And a short on that.

I need to offer an alternative. "More" button? The additional information is basically additional columns, which are only of secondary importance, to the persistent columns.

Thank you for your advice.