xls

Use when an agent needs to read, modify, create, or inspect .xlsx / .xlsm / .xls workbooks. A stateful, formula-aware Excel engine (Java / Apache POI, stdio MCP): open an existing workbook or create one in memory, richly edit it across a whole session without reloading — values, typed formulas, cell styling, sheet structure, rows/columns, tables, named ranges — then recalculate formulas headlessly and save atomically. 28 tools across workbook lifecycle, range I/O (incl. cell styling), sheet management and presentation, row/column mutation, tables, named ranges, and read-only VBA extraction. Unlike code-based editing (openpyxl/pandas or Claude's built-in spreadsheet handling), it evaluates ~280 Excel functions in place so formula results are real not stale, every read separates a genuine value from an uncomputed formula, and a single POI writer avoids the 'Excel repaired records' corruption that second-writer libraries cause.