Agent skill · software engineering · davila7
xlsx-official
Use this skill any time a spreadsheet file is the primary input or output. This means any task where the user wants to: open, read, edit, or fix an existing .xlsx, .xlsm, .csv, or .tsv file (e.g., adding columns, computing formulas, formatting, charting, cleaning messy data); create a new spreadsheet from scratch or from other data sources; or convert between tabular file formats. Trigger especially when the user references a spreadsheet file by name or path — even casually (like \"the xlsx in my downloads\") — and wants something done to it or produced from it. Also trigger for cleaning or restructuring messy tabular data files (malformed rows, misplaced headers, junk data) into proper spreadsheets. The deliverable must be a spreadsheet file. Do NOT trigger when the primary deliverable is a Word document, HTML report, standalone Python script, database pipeline, or Google Sheets API integration, even if tabular data is involved.
Why this skill is useful
Adds specific formatting and formula construction rules for Excel files that the AI wouldn't reliably generate on its own.
What it needs
Requires libreoffice 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 Professional Font Use a consistent, professional font (e.g., Arial, Times New Roman) for all deliverables unless otherwise instructed by the user 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, n …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills davila7/xlsx-official