What problem does it solve? Spreadsheets generated by AI often contain hardcoded values instead of live formulas, broken references like #REF! or #DIV/0!, and formatting that falls apart when opened in Excel. This Skill builds and edits .xlsx workbooks where every derived value is a real formula, then verifies the result through recalculation and visual rendering before delivery. ## Core Features & Use Cases - Workbook Creation and Editing: Build or modify .xlsx files with ExcelJS, applying proper number formats, column widths, and the blue-input/black-formula financial modeling color convention. - Formula Verification: Recalculate workbooks with cdx-recalc to detect error cells (#REF!, #DIV/0!, #NAME?) and iterate until the workbook reports zero errors. - Visual Review: Render sheets to PNG images with cdx-render to catch layout issues like ### columns, raw float formatting, and text overflow. - Use Case: Ask for a twelve-month cash flow model and receive a workbook where totals, growth rates, and margins are live formulas that update when you change any input cell. ## Quick Start Ask the assistant to create an Excel workbook with a twelve-month cash flow including formulas, and to verify it contains no error cells.
