Excel Spreadsheets (xlsx) Skill

What it does

This skill covers any task where a spreadsheet is the main input or output: open .xlsx, .csv or .tsv files, add columns, compute formulas, fix formatting, or build a new workbook.

Why it is useful

• Claude writes real formulas, so the sheet stays live when the numbers change.
• It can turn a messy CSV export into a tidy workbook.

How to use it

/plugin marketplace add anthropics/skills
/plugin install document-skills@anthropic-agent-skills

Watch out for

• Check the formulas on a copy before you trust them with real money.