XLSX

XLSX is an Anthropic skill for creating, editing, inspecting and analyzing spreadsheet files while preserving formulas, formatting and existing workbook structure. It is aimed at real spreadsheet work such as analysis models, calculations, templates and financial-style workbooks rather than exporting a simple CSV.

• Analysts working with Excel-compatible workbooks
• Finance or operations teams maintaining formula-driven models
• Users editing existing spreadsheet templates
• Agents creating structured calculation or reporting workbooks

• Create a workbook with formulas and formatted tables
• Modify an existing Excel file without destroying formulas
• Inspect workbook sheets and calculation logic
• Build a financial or operational model with reusable formulas

The skill works with the spreadsheet as a structured workbook: sheets, cells, formulas, formatting and existing templates are treated as first-class data. It preserves calculation logic where possible, applies spreadsheet conventions and verifies the resulting workbook instead of flattening the file into plain values.

• Preserves formulas and workbook structure
• Useful for both editing and new spreadsheet creation
• Supports analysis and financial-modeling style workflows
• Keeps formatting and calculation logic together

• Spreadsheet formulas still need business-logic validation
• Macros and highly specialized Excel features may require additional tooling
• Complex models should be reviewed for both numerical and presentation accuracy