Document XLSX Skill — Quick Reference This skill enables creation, editing, and analysis of Excel spreadsheets programmatically. Claude should apply these patterns when users need to generate data reports, financial models, automate Excel workflows, or process spreadsheet data. Modern Best Practices (Jan 2026) : - Treat spreadsheets as software: clear inputs/outputs, auditability, and versioning. - Protect data integrity: control totals, validation, and traceability to sources. - Accessibility: labels, contrast, structure; use Excel's Accessibility Checker; meet procurement/regulatory require…