Xlsx Author

When you're running Claude in headless mode and need to produce an Excel file as an artifact rather than driving a live workbook through the Office plugin, this is your tool. It writes a Python script using openpyxl, dumps a proper .xlsx to ./out/, and follows the same blue/black/green conventions as audit-xls: blue for hardcoded inputs, black for formulas, green for links. You get named ranges, balance checks, and a strict one-model-per-file discipline. It's the file-producing fallback for managed-agent sessions where there's no open Excel window to interact with. Skip it if the mcp__office__excel_* tools are available, those let users review changes in real time.