Xlsx

This handles everything spreadsheet related: creating financial models from scratch, analyzing existing data, and modifying templates while preserving their formulas and formatting. It enforces zero formula errors through mandatory recalculation with LibreOffice, and ships with opinionated standards for financial modeling (blue text for inputs, black for formulas, specific number formatting). The documentation is thorough on formula construction and includes a recalc.py script that catches errors like #REF! and #DIV/0! before you share anything. Useful if you're building projection models or need Claude to actually understand Excel conventions instead of just dumping CSV data into cells. The color coding rules alone will save arguments with finance teams.

Install to Claude Code

npx -y skills add aiskillstore/marketplace --skill xlsx --agent claude-code