Agent skill · writing content · davila7
xlsx
Spreadsheet toolkit (.xlsx/.csv). Create/edit with formulas/formatting, analyze data, visualization, recalculate formulas, for spreadsheet processing and analysis.
Why this skill is useful
Provides specific formatting and formula construction rules for financial models that the AI wouldn't reliably generate on its own.
What it needs
Requires openpyxl, pandas installed locally. About 6k tokens when loaded. Last updated 2026-08-06. 30,138 stars on the source repository.
What this skill does
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 Years: Format as text strings (e.g., "2024" not "2,024") Currency: Use $#,##0 format; ALWAYS specify units in headers ("Revenue ($mm)") Zeros: Use number formatting to make all zeros "-", including percentages (e.g., "$#,##0;($#,##0);-") Percentages: Default to 0.0% format (one decimal) Multiples: Format as 0.0x for valuation multiples (EV/EBITDA, P/E) Negative numbers: Use parentheses (123) not minus -123 Formula Construction Rules Assumptions Placement Place ALL assumptions (growth rates, margins, multiples, etc.) in separate assumption cells Use cell references instead of hardcoded values in formulas Example: Use =B5(1+$B$6) instead of =B51.05 Formula Error Prevention Verify all cell references are correct Check for off-by-one errors in ranges Ensure consistent formulas across all projection periods Test with edge cases (zero values, negative numbers) Verify no unintended circular references Documentation Requirements for Hardcodes Comment or in cells beside (if end of table). …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills davila7/xlsx--46afa1