Is the Excel / XLSX skill free?

Yes. The skill itself is free from waterfeet/DoroPet_V3. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Excel / XLSX SkillProof Score?

9.6/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 5/5.

How do I install Excel / XLSX?

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 Excel / XLSX 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.

Excel / XLSX

Behavioral rules for building and editing Excel workbooks that stay live and correct.

by waterfeet · waterfeet/DoroPet_V3

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.6/10
Tested: Jul 15, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 1b13745

Ran a real A/B building a 5-row sales workbook: the baseline (no skill) wrote dates as plain strings and hardcoded Total/Grand-Total as static Python-computed numbers; the skill-guided version wrote real datetime cells with number formats and live '=C2*D2' / '=SUM(E2:E6)' formulas that recalc if a user edits Units in Excel — exactly the failure mode Rule 3 warns about, reproduced and fixed.

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 5/5

What Excel / XLSX does

A rules-only skill (no bundled scripts) covering openpyxl vs pandas choice, Excel date-serial quirks, keeping formulas live instead of hardcoding computed values, type preservation, and template/structure preservation. Triggers on .xlsx/.xlsm/.xls/.csv/.tsv work where formulas, formatting or workbook structure matter.

How to install Excel / XLSX

git clone https://github.com/waterfeet/DoroPet_V3
cd DoroPet_V3
mkdir -p ~/.claude/skills
cp -r opendoro/src/skills/excel-xlsx ~/.claude/skills/excel-xlsx

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

Commands — how to trigger Excel / XLSX

/excel-xlsx Behavioral rules for building and editing Excel workbooks that stay live and correct.

It also activates on plain-language prompts like these:

Add a SUMIFS column to this Excel workbook without breaking the formulas
Convert this messy CSV export into a proper Excel report with formatting
Fix my .xlsx so the totals recalc automatically when I edit unit counts

Frequently asked questions

Is the Excel / XLSX skill free?: Yes. The skill itself is free from waterfeet/DoroPet_V3. SkillProof publishes the install command and an independent test verdict at no cost.
Does Excel / XLSX work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 15, 2026. Verdict: Tested · Works. Ran a real A/B building a 5-row sales workbook: the baseline (no skill) wrote dates as plain strings and hardcoded Total/Grand-Total as static Python-computed numbers; the skill-guided version wrote real datetime cells with number formats and live '=C2*D2' / '=SUM(E2:E6)' formulas that recalc if a user edits Units in Excel — exactly the failure mode Rule 3 warns about, reproduced and fixed.
What is the Excel / XLSX SkillProof Score?: 9.6/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 9/10, docs & honesty 5/5.
How do I install Excel / XLSX?: 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 Excel / XLSX 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.