xlsx Claude Code Skill

This skill is for creating, editing, reading, and converting spreadsheet files, including xlsx, xlsm, xltx, csv, and tsv formats. It relies on Python libraries such as openpyxl and pandas for building or modifying spreadsheets, markitdown for quick content previews, and a LibreOffice-based recalculation script to compute formula results and check for errors. It enforces conventions such as avoiding hardcoded formula results, documenting assumptions, and matching an existing file's formatting when editing. It also defines formatting rules for financial models, such as color-coding and number formats. It is invoked whenever the main input or output of a task is a spreadsheet file.