Xlsx

When you need Claude to read, write, or modify actual spreadsheet files rather than just talk about data. This triggers for opening existing xlsx/csv files, creating new ones, cleaning messy tabular data, or converting between formats. The deliverable has to be a spreadsheet file itself. It comes with openpyxl and pandas workflows, automatic formula recalculation via LibreOffice, and surprisingly detailed financial modeling conventions (blue for inputs, black for formulas, that whole thing). The rules are opinionated about using Excel formulas instead of hardcoding Python calculations, which makes sense if you want spreadsheets that actually update. Good for when the artifact needs to be an Excel file someone can open and use, not just analysis output.

skills.sh installs: 122
GitHub stars: 848
last updated: Jun 3, 2026

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Install

$ npx -y skills add guanyang/antigravity-skills --skill xlsx --agent claude-code

Installs into .claude/skills of the current project.

Files

XLSX creation, editing, and analysis

Task	Approach
Create or edit with formulas/formatting	`openpyxl` — see gotchas below
Bulk data in or out	`pandas` (`read_excel`, `to_excel`)
Quick look at a sheet	`markitdown file.xlsx` — `## SheetName` per sheet; reads `.xlsm` too. No cell coordinates, so don't plan edits from it
Read a model (formulas and values)	two `load_workbook` passes — see gotchas

openpyxl, pandas, and markitdown are preinstalled — do not run pip install first; write the script and import directly. Only if an import fails (or the markitdown command is missing): pip install the missing package.