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Excel Spreadsheets (XLSX)

Build and fix Excel workbooks with working formulas, charts and clean data.

Official Anthropicby AnthropicChecked October 18, 2026

Anthropic's official spreadsheet skill for creating, cleaning and editing Excel and CSV files. It treats formulas as first-class, recalculating and checking them so the workbook you get back actually computes.

Who it is for

  • Finance teams
  • Analysts
  • Small business owners
  • Operations staff

Prompts to try

Once the skill is installed, ask for the result in plain words. Claude picks the skill up on its own.

Prompt 1
Clean up sales_export.csv and turn it into an Excel file with a monthly summary sheet
Prompt 2
Build a simple budget spreadsheet with formulas for totals and variance
Prompt 3
Fix the broken formulas in forecast.xlsx and tell me what was wrong

How to install it

In Claude Code

  1. /plugin marketplace add anthropics/skills
  2. /plugin install document-skills@anthropic-agent-skills

In Claude.ai

Built into Claude.ai for all plans: turn on Code execution and file creation in Settings > Capabilities and Claude uses it automatically.

Good to know

Part of the document-skills plugin.

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How we checked it

Confirmed SKILL.md at skills/xlsx/SKILL.md in anthropics/skills via the GitHub API; skill folder last changed 2026-07-17, repo has 181,779 stars and was pushed 2026-10-09; the skill folder carries Anthropic's source-available license file.

Source: github.com/anthropics/skills/tree/main/skills/xlsx

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