Is the XLSX — Excel Spreadsheets skill free?

Yes. The skill itself is free from anthropics/skills. SkillProof publishes the install command and an independent test verdict at no cost.

What is the XLSX — Excel Spreadsheets SkillProof Score?

9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 4/5.

How do I install XLSX — Excel Spreadsheets?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use XLSX — Excel Spreadsheets with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

XLSX — Excel Spreadsheets

Read, clean and build spreadsheets with working formulas.

by Anthropic · anthropics/skills

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.2/10
Tested: Jun 24, 2026
Environment: Claude Code 2.x
Upstream re-checked: Aug 10, 2026 · 9da5480

Cleaned a 40k-row export with malformed headers, added formula columns and a pivot summary sheet. Formulas recalculated correctly in Excel and Google Sheets.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 9/10
Docs & honesty 4/5

What XLSX — Excel Spreadsheets does

Handles .xlsx, .xlsm, .csv and .tsv end to end: reading messy exports, fixing structure, computing formula columns, formatting and charting. Tested specifically on dirty real-world data, not demo tables — it held up.

How to install XLSX — Excel Spreadsheets

git clone https://github.com/anthropics/skills
cd skills
mkdir -p ~/.claude/skills
cp -r skills/xlsx ~/.claude/skills/xlsx

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger XLSX — Excel Spreadsheets

/xlsx Read, clean and build spreadsheets with working formulas.

It also activates on plain-language prompts like these:

Clean up this messy CSV export and turn it into a proper xlsx
Add working formula columns to this spreadsheet and format it
Build a chart in this Excel file from the sales data

Appears in

Frequently asked questions

Is the XLSX — Excel Spreadsheets skill free?: Yes. The skill itself is free from anthropics/skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does XLSX — Excel Spreadsheets work with Claude Code?: We tested it with Claude Code 2.x on Jun 24, 2026. Verdict: Tested · Works. Cleaned a 40k-row export with malformed headers, added formula columns and a pivot summary sheet. Formulas recalculated correctly in Excel and Google Sheets.
What is the XLSX — Excel Spreadsheets SkillProof Score?: 9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 4/5.
How do I install XLSX — Excel Spreadsheets?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use XLSX — Excel Spreadsheets with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.