XLSX — Excel Spreadsheets

Name: XLSX — Excel Spreadsheets
Author: Anthropic

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

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 it 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.

Install

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

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

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