skill CX Codex

xlsx · tfriedel — Claude Code skill: what it does, how to install

Q: How to install xlsx in Claude Code?

Run `npx skills add tfriedel/claude-office-skills --skill xlsx -a claude-code` in your terminal.

Q: Why is LibreOffice required?

LibreOffice is used by `recalc.py` to evaluate workbook formulas from the command line and flag issues such as `#DIV/0!` or `#REF!` in JSON format.

Teaches agents to generate clean spreadsheets, keep formulas dynamic, and enforce financial modeling standards.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓

npx skills add tfriedel/claude-office-skills --skill xlsx -a claude-code

Open on GitHub

What xlsx does

The skill stops the agent from baking Python-calculated numbers directly into cells. It requires native Excel formulas through openpyxl and reserves pandas for data inspection and summaries. This ensures the output remains interactive when inputs change.

For financial workbooks, it applies strict styling conventions. Hardcoded inputs use blue text, calculations stay black, cross-sheet references turn green, and assumptions needing review receive yellow fills. Broken outputs containing #REF! or #DIV/0! are rejected immediately.

Without a local LibreOffice installation, the bundled recalc.py script cannot recalculate cells to produce the error report. Every generation step expects this verification to run before the file is treated as ready.

What it helps with

build financial models with standard color coding and cell references
update existing xlsx workbooks while preserving layout and formatting
detect formula errors like #REF! and #DIV/0! before delivery
replace static Python calculations with dynamic spreadsheet formulas

Example prompts for the agent

Build a revenue forecast in model.xlsx, put assumptions into dedicated cells, and verify formulas.
Update data.xlsx with dynamic margin formulas instead of hardcoded numbers and run recalc.py.
Inspect the sheets in report.xlsx and format all negative values with parentheses.

How to install xlsx

1Skills CLI (Vercel)

npx skills add tfriedel/claude-office-skills --skill xlsx -a claude-code

2Manually: put the files in place

~/.claude/skills/xlsx/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/xlsx/

1Skills CLI (Vercel)

npx skills add tfriedel/claude-office-skills --skill xlsx -a codex

2Manually: put the files in place

.agents/skills/xlsx/SKILL.md

For all projects use ~/.agents/skills/

1Skills CLI (Vercel)

npx skills add tfriedel/claude-office-skills --skill xlsx -a cursor

2Manually: put the files in place

.cursor/skills/xlsx/SKILL.md

Cursor also reads .agents/skills/ and .claude/skills/

1GitHub CLI

gh skill install tfriedel/claude-office-skills xlsx

2Manually: put the files in place

.github/skills/xlsx/SKILL.md

1Skills CLI (Vercel)

npx skills add tfriedel/claude-office-skills --skill xlsx -a gemini-cli

2Platform CLI

gemini skills install https://github.com/tfriedel/claude-office-skills --path public/xlsx

Manually: put the files in place

.devin/skills/xlsx/SKILL.md

The legacy .windsurf/skills/ path still works

Skills CLI (Vercel)

npx skills add tfriedel/claude-office-skills --skill xlsx -a opencode

Step by step, with commands for each platform: How to install skills in Claude Code: five ways

Questions about xlsx

How to install xlsx in Claude Code?

Run npx skills add tfriedel/claude-office-skills --skill xlsx -a claude-code in your terminal.

What does the xlsx skill do?

It guides the agent through working with spreadsheets, mandating native Excel formulas, consistent color coding for finance models, and automated formula testing.

Why is LibreOffice required?

LibreOffice is used by recalc.py to evaluate workbook formulas from the command line and flag issues such as #DIV/0! or #REF! in JSON format.

Similar skills

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xlsx by other authors comes first.

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