format-xlsx
Comprehensive spreadsheet creation, editing, and analysis — formulas, formatting, data analysis, and visualization. Use when working with spreadsheets (.xlsx, .xlsm, .csv, .tsv) to create a new one, read or analyze data, modify an existing one while preserving formulas, recalculate formulas, or build a chart. Not for a Word document (format-docx), a PowerPoint deck (format-pptx), or a data-viz chart to embed elsewhere (format-chart).
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