This handles the three Excel problems Claude usually hits on macOS: creating formatted reports with openpyxl (investment banking color conventions included), parsing complex xlsm files that openpyxl chokes on using stdlib zipfile and xml parsing, and controlling Excel windows via AppleScript. The parsing approach is genuinely useful because it works around corrupted DefinedNames in financial models and handles the ZIP-based xlsx structure directly when openpyxl fails. Includes a decision tree for tool selection and specific fixes for "Formula removed" corruption in investment bank files. The formatting patterns follow actual IB standards with proper RGB codes for input cells, calculations, and cross-sheet references.
npx skills add https://github.com/daymade/claude-code-skills --skill excel-automation