Read a Tableau workbook before importing it

One uploaded .twb or .twbx -> what it contains and what an import would produce: worksheet and dashboard counts, the charts it uses, the custom formulas that will not survive, and TWO coverage numbers — the share of the workbook's questions that stay answerable on the imported data, and the share of its worksheets that port as the same chart. Both are returned because quoting either alone misleads. Read-only: nothing is imported, no dataset is created, and no model is called.