This is a comprehensive spreadsheet tool that handles the full lifecycle of Excel work: creating files with openpyxl, analyzing data with pandas, and recalculating formulas through LibreOffice. The standout piece is its opinionated guidance on financial modeling conventions (blue text for inputs, black for formulas, specific number formatting) and its absolute insistence on zero formula errors with a built-in verification script that scans for #REF!, #DIV/0!, and other errors. It's particularly aggressive about making Claude use actual Excel formulas instead of hardcoding calculated values in Python, which is the right call if you want spreadsheets that remain functional after creation. The documentation requirements for hardcoded assumptions are thorough, almost to the point of being tedious, but that's probably what you want in financial work.

skills.sh installs
244
GitHub stars
76
last updated
Aug 21, 2026

Install

$ npx -y skills add rysweet/amplihack --skill xlsx --agent claude-code

Installs into .claude/skills of the current project.

Files

Requirements for Outputs

All Excel files

Zero Formula Errors

  • Every Excel model MUST be delivered with ZERO formula errors (#REF!, #DIV/0!, #VALUE!, #N/A, #NAME?)

Preserve Existing Templates (when updating templates)

  • Study and EXACTLY match existing format, style, and conventions when modifying files
  • Never impose standardized formatting on files with established patterns
  • Existing template conventions ALWAYS override these guidelines

Financial models

Color Coding Standards

Unless otherwise stated by the user or existing template

Industry-Standard Color Conventions
  • Blue text (RGB: 0,0,255): Hardcoded inputs, and numbers users will change for scenarios
  • Black text (RGB: 0,0,0): ALL formulas and calculations
  • Green text (RGB: 0,128,0): Links pulling from other worksheets within same workbook
  • Red text (RGB: 255,0,0): External links to other files
  • Yellow background (RGB: 255,255,0): Key assumptions needing attention or cells that need to be updated

Number Formatting Standards

Required Format Rules

Sponsors

Details

Repository
github.com/rysweet/amplihack
Categories
Data Science & ML, Office & Documents
First seen
Jun 3, 2026

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