minimax-xlsx

Handles Excel and CSV/TSV files through direct XML manipulation rather than library round-trips. Covers reading, creating from scratch, editing existing files without format loss, formula repair, and validation. Applies financial formatting standards including formula-based calculations and color-coded cell roles. Unlike openpyxl round-trips that corrupt VBA macros, pivot tables, and sparklines, this skill edits the underlying XML directly so existing formatting and features survive.