xlsx Claude Code Skill

This skill enables Claude to handle spreadsheet files—.xlsx, .xlsm, .xltx, .csv, and .tsv—whenever such a file is the main input or output of a task. It covers creating new spreadsheets, editing existing ones, computing formulas, applying formatting, building charts, and cleaning up disorganized tabular data. The workflow relies on openpyxl for formula and formatting work, pandas for bulk data reading and writing, and markitdown for quick sheet previews. Per the SKILL.md instructions, a LibreOffice-based recalculation script must be run before delivery to confirm formulas evaluate without errors. It is not meant to be used when the final deliverable is something other than a spreadsheet file, such as a Word document or a standalone script.