Create, read, edit, and manipulate spreadsheet files (.xlsx, .csv, .tsv) with formulas, charts, and data transformations.
What it does
Claude generates openpyxl or xlsxwriter code that produces a spreadsheet — but one with no formatting, no frozen headers, formulas that don't account for dynamic row counts, and charts that use the wrong chart type for the data. This skill loads correct patterns for spreadsheet generation: proper cell formatting, named ranges, formula construction for variable-length data, chart configuration, and conditional formatting that actually highlights what you want.
Use case
Generating spreadsheets programmatically from data: financial reports, data exports, dashboards that need to live in Excel. Most valuable when the output needs to be usable by non-technical stakeholders without manual cleanup. Made by Anthropic.
"Generate a monthly P&L report from this data with totals, percentages, and a chart." "Create a project budget spreadsheet with cost categories and a summary tab." "Export this database query result as a formatted Excel file with frozen headers." "Build a sales dashboard in Excel with sparklines and conditional formatting." "Generate an invoice template in Excel with automatic total calculation."
Provide structured data (JSON, CSV, or database query result) and describe the intended output.
Claude generates the spreadsheet file with formatting, formulas, and charts applied.
For templates: describe the structure and Claude builds a reusable template with named ranges and locked cells.
Input
Structured data (JSON, CSV, SQL result) and a description of the spreadsheet layout and formatting you need.
Output
An .xlsx file with correct formatting, frozen headers, properly scoped formulas, and charts configured for the data type. Ready to open without manual formatting.
npx skillsadd anthropics/skills/xlsx
npx skillsadd anthropics/skills/xlsx
Requires skills.sh CLI
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