Xlsx

This handles any task where the primary deliverable is a spreadsheet file: creating new ones, editing existing xlsx/csv/tsv files, or cleaning messy tabular data. The standout feature is its opinionated financial modeling standards (blue for inputs, black for formulas, yellow highlights for assumptions) and strict formula-first approach. It refuses to hardcode calculated values in Python, instead writing Excel formulas so your sheets stay dynamic. Built-in LibreOffice integration recalculates formulas and catches errors before delivery. The zero-error mandate is aggressive but makes sense if you're shipping models to clients. Worth knowing it explicitly won't trigger for tasks where spreadsheets are just incidental, like generating Python scripts that happen to process CSV data or building Word reports from tables.