XLSX Skill for Claude: Build and Clean Spreadsheets
Anthropic's xlsx skill lets Claude create, edit and clean spreadsheets with working formulas, formatting and charts. Install command, prompts and tips.
By Claudekit Team Published 1 min read
- Category
- Documents
- Source
- github.com
- Repository
- github.com
- GitHub stars
- 183,344
- License
- Proprietary (source-available)
Install
/plugin install document-skills@anthropic-agent-skillsThe xlsx skill covers any task where a spreadsheet file is the main input or output. It is part of Anthropic’s document skills and is opinionated about one thing in particular: formulas in the finished file should work.
What it does
- Opens, reads, edits and fixes
.xlsx,.xlsm,.xltx,.csvand.tsvfiles: adding columns, computing formulas, formatting, charting. - Creates spreadsheets from scratch or from other data sources.
- Converts between tabular formats.
- Cleans messy data: malformed rows, misplaced headers, junk values.
- Recalculates whenever formulas are present, and includes guidance for financial models and openpyxl pitfalls.
Install
/plugin marketplace add anthropics/skills
/plugin install document-skills@anthropic-agent-skillsThis installs xlsx alongside pdf, docx and pptx. On claude.ai the capability is available on paid plans. See the skills guide.
Example usage
Clean up the xlsx in my downloads: fix the headers and remove blank rows
Build a 12-month cash flow model with formulas, not hard-coded numbers
Merge these three CSV exports into one spreadsheet with a summary sheet and a chartTips
- Say whether you want live formulas or static values.
- Reference the file by path; the skill triggers even on casual mentions such as “the spreadsheet in my downloads”.
- For SQL-sourced data, query first (for example via DBHub), then hand the export to this skill.
Source and license
Source: anthropics/skills/skills/xlsx. License: proprietary, source-available; see LICENSE.txt.
Frequently asked questions
Which file types does the xlsx skill handle?
Its description lists .xlsx, .xlsm, .xltx, .csv and .tsv files as inputs or outputs, with a spreadsheet file as the deliverable.
Will formulas actually calculate?
The skill makes recalculation mandatory whenever a file contains formulas and guides Claude toward formulas that survive verification.
Should I use it for Google Sheets?
No. The skill says not to trigger for Google Sheets API integrations, database pipelines or when the deliverable is a Word document or HTML report.