# XLSX

> 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

- Skill: `dokhacgiakhoa/xlsx` (Agent Skill, multi-file: 20 files)
- Install (CLI): `npx skillmds@latest add dokhacgiakhoa/xlsx`
- Raw SKILL.md: https://api.skillmd.com/api/skills/dokhacgiakhoa/xlsx/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Data & Analytics
- License: Proprietary. LICENSE.txt has complete terms
- Author: Dokhacgiakhoa (https://skillmd.com/u/dokhacgiakhoa)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/dokhacgiakhoa/xlsx

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# 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)