xlsx agent skill by anthropics
Opens, edits, creates, and converts spreadsheet files such as .xlsx and .csv, including formulas, formatting, charts, and cleaning messy tabular data.
At a glance
| Publisher | Anthropic Official |
|---|---|
| Repository | anthropics/skills (17 listed skills) |
| Category | Documents and Office Files |
| License | Proprietary |
| Last commit | October 9, 2026 (repository) |
| SKILL.md | 93 lines, 1,149 words |
| Bundled files | 53 files, including scripts |
| Quality score | 85/100 · B Passes all seven graded checks |
| Security scan | Not scanned |
| README badge | Get the badges for this listing |
Before you install
Read from the skill's files at the directory's October 19, 2026 snapshot: what ships with it, what its code reads, and the terms it is published under.
- Bundled scripts: 12 script files (12 Python). Your agent may run them, so read them first.
- License: Proprietary. Its terms restrict copying the files; read them before you use the skill.
How to use xlsx
Anthropic publishes xlsx under its own license terms, which restrict copying the files.
Anthropic distributes its document skills through its own Claude Code plugin marketplace. Its repository README gives these commands:
/plugin marketplace add anthropics/skills
/plugin install document-skills@anthropic-agent-skillsSource: Anthropic's documentation.
How the author describes it
Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to: open, read, edit, or fix an existing .xlsx, .xlsm, .xltx, .csv, or .tsv file (e.g., adding columns, computing formulas, formatting, charting, cleaning messy data); create a new spreadsheet from scratch or from other data sources; or convert between tabular file formats. Trigger especially when the user references a spreadsheet file by name or path — even casually (like "the xlsx in my downloads") — and wants something done to it or produced from it. Also trigger for cleaning or restructuring messy tabular data files (malformed rows, misplaced headers, junk data) into proper spreadsheets. The deliverable must be a spreadsheet file. Do NOT trigger when the primary deliverable is a Word document, HTML report, standalone Python script, database pipeline, or Google Sheets API integration, even if tabular data is involved.
From the description field of SKILL.md. Agents read this line to decide when to load the skill.
Sections in SKILL.md
- Requirements for every output
- Recalculate (mandatory whenever the file contains formulas)
- Choosing formulas that survive verification
- openpyxl gotchas
- Financial models
- Dependencies
Files in the skill folder
LICENSE.txtSKILL.mdscripts/office/helpers/__init__.pyscripts/office/helpers/pptx_chart.pyscripts/office/helpers/pptx_slide.pyscripts/office/helpers/pptx_theme.pyscripts/office/schemas/ISO-IEC29500-4_2016/dml-chart.xsdscripts/office/schemas/ISO-IEC29500-4_2016/dml-chartDrawing.xsdscripts/office/schemas/ISO-IEC29500-4_2016/dml-diagram.xsdscripts/office/schemas/ISO-IEC29500-4_2016/dml-lockedCanvas.xsdscripts/office/schemas/ISO-IEC29500-4_2016/dml-main.xsdscripts/office/schemas/ISO-IEC29500-4_2016/dml-picture.xsdscripts/office/schemas/ISO-IEC29500-4_2016/dml-spreadsheetDrawing.xsdscripts/office/schemas/ISO-IEC29500-4_2016/dml-wordprocessingDrawing.xsdscripts/office/schemas/ISO-IEC29500-4_2016/pml.xsdscripts/office/schemas/ISO-IEC29500-4_2016/shared-additionalCharacteristics.xsdscripts/office/schemas/ISO-IEC29500-4_2016/shared-bibliography.xsdscripts/office/schemas/ISO-IEC29500-4_2016/shared-commonSimpleTypes.xsdscripts/office/schemas/ISO-IEC29500-4_2016/shared-customXmlDataProperties.xsdscripts/office/schemas/ISO-IEC29500-4_2016/shared-customXmlSchemaProperties.xsdscripts/office/schemas/ISO-IEC29500-4_2016/shared-documentPropertiesCustom.xsdscripts/office/schemas/ISO-IEC29500-4_2016/shared-documentPropertiesExtended.xsdscripts/office/schemas/ISO-IEC29500-4_2016/shared-documentPropertiesVariantTypes.xsdscripts/office/schemas/ISO-IEC29500-4_2016/shared-math.xsd
Showing 24 of 53 files. Browse the folder on GitHub.
Suede Skill Check: 85/100 · B
Report snapshot · · graded-v2
The rubric totals 100 points; published scores are capped at 99. Security scan: not scanned.
Source revision: dbd4588f9e10. Report version 03d851d134c8. Badge URLs follow the latest listing; save the report to keep this version.
Download report · Request a fresh review
What to review next
- Description length: 1 of 5 points. 5 for 150–600 characters; 3 for 100–900; 1 for 50–1,024.
- Boundary clause: 0 of 4 points. 4 when the description says when not to use the skill (“Not for …”, “Do not use …”, “Use … instead”).
- Reference files: 0 of 3 points. 3 when the skill folder ships a references/, reference/ or docs/ folder.
Add declarations and bundled files when they describe the skill’s actual needs. Update the source, then request a fresh review with the changed commit or PR.
xlsx passes the required frontmatter check and all seven graded checks, which cover the SKILL.md format, a declared license and a commit in the last year. Those checks earn 56 of the score’s points; the rest come from description quality, instruction depth, bundled files, maintenance and curated-list citations. How the score works.
See the checks and points
| Check | Result |
|---|---|
| Frontmatter parses and declares a name and a description | Pass |
| Name uses lowercase letters, digits and hyphens, 64 characters or fewer | Pass |
| Name matches the skill's folder name | Pass |
| Description is between 50 and 1,024 characters | Pass |
| Description says when an agent should use the skill | Pass |
| SKILL.md body is 500 lines or fewer | Pass |
| A license is declared in the frontmatter or the repository | Pass |
| Repository has a commit in the last 12 months | Pass |
| Score component | Points |
|---|---|
| Structural checks | 56 of 56 |
| Description length | 1 of 5 |
| Boundary clause | 0 of 4 |
| Example request | 3 of 3 |
| Instruction depth | 7 of 7 |
| Reference files | 0 of 3 |
| Bundled scripts | 2 of 2 |
| Recent maintenance | 9 of 9 |
| Curated-list citations | 7 of 7 |
| Tool permissions declared | 0 of 2 |
| Compatibility declared | 0 of 2 |
Two badges for xlsx
Choose the numeric badge, the letter badge, or both. Each links to this skill’s Suede listing; either valid linked badge can qualify for the feature offer.
[](https://skills.suedeai.ai/directory/anthropics/skills/xlsx/)
[](https://skills.suedeai.ai/directory/anthropics/skills/xlsx/)<a href="https://skills.suedeai.ai/directory/anthropics/skills/xlsx/"><img src="https://skills.suedeai.ai/directory/anthropics/skills/xlsx/score.svg" alt="Suede Skill Check: 85/100" width="160" height="175"></a>
<a href="https://skills.suedeai.ai/directory/anthropics/skills/xlsx/"><img src="https://skills.suedeai.ai/directory/anthropics/skills/xlsx/badge.svg" alt="Suede Skill Check: Grade B" width="160" height="175"></a>Suede Certified on the shield refers to this published structural quality check. Security scan: not scanned. Read the methodology.
Limited-time feature offer: display either the numeric or letter badge in your repository or skill README (both also qualify), then request badge verification. Eligible skills scoring 80–99 can receive a featured placement after Suede verifies at least one valid badge linked to the skill’s listing. Suede has not announced an end date.
Where this skill is cited
anthropics/skills appears in 7 curated lists: BehiSecc/awesome-claude-skills, ComposioHQ/awesome-claude-skills, heilcheng/awesome-agent-skills, hesreallyhim/awesome-claude-code, karanb192/awesome-claude-skills, skillmatic-ai/awesome-agent-skills, travisvn/awesome-claude-skills.