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xlsx

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Write a real Excel workbook (.xlsx) from JSON or CSV — several sheets, styled header, numbers, formulas, a SUM total row — or read an existing .xlsx back to JSON/CSV. Standard library only, no Excel needed.

skills/bundled/xlsx/SKILL.md

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Oct 27, 2026
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# xlsx

Create a `.xlsx` that opens in Excel, LibreOffice Calc and Google Sheets, or
read one so its numbers can be analysed, merged or re-shaped. No extra
packages: the script builds the OOXML package itself.

## When to use

- The user wants a spreadsheet: a summary table, merged data from several
  workbooks, a list with totals.
- The user has `.xlsx` files in an allowed folder and wants to combine or
  analyse them — **read** each one first, then **write** the result.

## How to run
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