Use this skill any time an Excel file (.xlsx, .xlsm) needs to be read, explored, understood, or modified. You cannot read .xlsx files with cat, head, or normal file-reading tools — this is the only way to inspect them. Trigger when you or the user need to open, look at, or explore a workbook; find out what sheets it has or where specific data lives; read cells, rows, columns, or ranges; search for values, labels, or patterns; trace formula dependencies or understand how a cell is calculated; run what-if scenarios by changing inputs and reading recalculated outputs; or edit cells, rows, columns, and sheets. Trigger when the user references a spreadsheet file by name or path — even casually (e.g. 'check the xlsx', 'what's in report.xlsx') — and also when you need to inspect a workbook yourself as part of a larger task. The tool runs sandboxed JavaScript against the workbook server-side via `witan xlsx exec`."
Data & AI
