xlsx: a Claude Code skill by Anthropic
Official
For people who want Claude to produce or repair Excel files whose formulas still work. Skip it if the result should be a Google Sheet, a written report or a database.
The skill's text changed on Nov 8, 2026, after we last read it. Our description may be behind.
- Score
- 89of 100
- Rank
- #13of 239
- Installs
- 197Kon skills.sh
- Security
- Mixed 5 scanners
- Updated
- 2026
- Context
- ~238tokens always
Install
npx skills add https://github.com/anthropics/skills --skill xlsx
Run it in your terminal. View the source
Using the Claude app rather than Claude Code? You can add a skill there too. How to add it in the app
What does xlsx do?
xlsx is a skill that lets Claude open, build, fix and convert spreadsheet files, including .xlsx, .xlsm, .csv and .tsv. It picks a tool per task: openpyxl for formulas and formatting, pandas for bulk data and markitdown for a quick look at each sheet. Totals go in as live formulas, not numbers computed in Python. After writing, Claude runs a recalc.py script that uses LibreOffice to compute every formula and name any cells with errors, then fixes them and runs it again. It avoids newer functions such as XLOOKUP and FILTER, keeps macros with keep_vba, and follows set colors and number formats for financial models.
When should you use xlsx?
Use it when
- Turning a messy CSV export into a clean spreadsheet
- Building a financial model with formulas you can change later
- Fixing formula errors in a workbook someone sent you
Skip it when
- The data should end up in a Google Sheet or database
- You want a Word report or chart page, not a spreadsheet
- Claude apps with code execution on already include Excel
What it needs and what it can touch
You need
- Python with openpyxl, pandas and markitdown
- LibreOffice for recalculating formulas
What it can do
- Runs Python scripts and shell commands
- Reads, edits and rewrites spreadsheet files on your machine
- Installs a missing Python package with pip if an import fails
From reading its instructions, not from running it.
Why it scores 89
Strongest on upkeep (100 of 100), weakest on adoption (74).
Is xlsx safe to install?
At least one scanner raised a medium warning. Read the results below. Scanners often miss what other scanners catch, and a skill can change after a scan. Read its source before you install it.
| Scanner | Result | Date |
|---|---|---|
| Gen Agent Trust Hub | Passed | Nov 7, 2026 |
| Socket | Medium risk | Nov 8, 2026 |
| Snyk | Low risk | Nov 7, 2026 |
| Runlayer | Low risk | Feb 26, 2026 |
| ZeroLeaks | Passed | Apr 16, 2026 |
Details
- Installs
- 196,798
- Repository stars
- 192,526
- Last repository change
- Tokens always loaded
- about 238
- Tokens when used
- about 1,875
- License
- Proprietary
- Data confidence
- High
Did it do the job for you?
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xlsx