Xlsx Official

---
version: 4.1.0-fractal
name: xlsx
description: "Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and visualization. When Claude needs to work with spreadsheets (.xlsx, .xlsm, .csv, .tsv, etc) for: (1) Creating new spreadsheets with formulas and formatting, (2) Reading or analyzing data, (3) Modify existing spreadsheets while preserving formulas, (4) Data analysis and visualization in spreadsheets, or (5) Recalculating formulas"
license: Proprietary. LICENSE.txt has complete terms
---

# Requirements for Outputs

## All Excel files

## 🧠 Knowledge Modules (Fractal Skills)

### 1. [Zero Formula Errors](./sub-skills/zero-formula-errors.md)
### 2. [Preserve Existing Templates (when updating templates)](./sub-skills/preserve-existing-templates-when-updating-templates.md)
### 3. [Color Coding Standards](./sub-skills/color-coding-standards.md)
### 4. [Number Formatting Standards](./sub-skills/number-formatting-standards.md)
### 5. [Formula Construction Rules](./sub-skills/formula-construction-rules.md)
### 6. [Data analysis with pandas](./sub-skills/data-analysis-with-pandas.md)
### 7. [❌ WRONG - Hardcoding Calculated Values](./sub-skills/wrong-hardcoding-calculated-values.md)
### 8. [✅ CORRECT - Using Excel Formulas](./sub-skills/correct-using-excel-formulas.md)
### 9. [Creating new Excel files](./sub-skills/creating-new-excel-files.md)
### 10. [Editing existing Excel files](./sub-skills/editing-existing-excel-files.md)
### 11. [Essential Verification](./sub-skills/essential-verification.md)
### 12. [Common Pitfalls](./sub-skills/common-pitfalls.md)
### 13. [Formula Testing Strategy](./sub-skills/formula-testing-strategy.md)
### 14. [Interpreting recalc.py Output](./sub-skills/interpreting-recalcpy-output.md)
### 15. [Library Selection](./sub-skills/library-selection.md)
### 16. [Working with openpyxl](./sub-skills/working-with-openpyxl.md)
### 17. [Working with pandas](./sub-skills/working-with-pandas.md)