Use case
Use Claude to build Excel workbooks
When to reach for the XLSX agent skill instead of CSV-in-chat, how to install it, and jobs it should refuse.
· 6 min read
Tables in chat are ephemeral. An .xlsx file with named sheets and formulas is a workbook a finance partner can open later. That is the intended job.
Give the agent a workbook job
Say which columns are inputs, which are formulas, and what the sheet names should be. Then install the Excel skill in the project so every session can emit a real file.
What not to do
Do not keep a data warehouse in Excel. Do not use this skill to write a narrative memo. If the output is a snapshot for email, a PDF is usually the more appropriate format.
Related reading
Skills cited in this guide
analysis
Excel Spreadsheet Skill
Build and analyze Excel (.xlsx) workbooks — formulas, multiple sheets, and tabular exports — from an agent instead of CSV paste.
productivity
PDF Skill
Read, fill, extract, and generate PDF documents from an agent session — forms, reports, and print-ready files rather than markdown-only output.
writing
Word Document Skill
Create and edit Microsoft Word (.docx) files with headings, tables, and tracked-change-friendly structure from an agent workflow.