xlwings Excel MCP Server

Instructions

Implementation Reference

• src/xlwings_mcp/server.py:1246-1299 (registration)

  MCP tool registration and handler wrapper for 'validate_excel_range'. Handles session validation, locking, supports legacy filepath mode, and delegates to xlwings implementations.
  @mcp.tool() def validate_excel_range( sheet_name: str, start_cell: str, session_id: Optional[str] = None, filepath: Optional[str] = None, end_cell: Optional[str] = None ) -> str: """ Validate if a range exists and is properly formatted. Args: sheet_name: Name of worksheet start_cell: Starting cell session_id: Session ID from open_workbook (preferred) filepath: Path to Excel file (legacy, deprecated) end_cell: Ending cell (optional) Note: Use session_id for better performance. filepath parameter is deprecated. """ try: # Support both new (session_id) and old (filepath) API if session_id: # New API: use session session = SESSION_MANAGER.get_session(session_id) if not session: return ERROR_TEMPLATES['SESSION_NOT_FOUND'].format( session_id=session_id, ttl=10 # Default TTL is 10 minutes (600 seconds) ) with session.lock: from xlwings_mcp.xlwings_impl.validation_xlw import validate_excel_range_xlw_with_wb result = validate_excel_range_xlw_with_wb(session.workbook, sheet_name, start_cell, end_cell) elif filepath: # Legacy API: backwards compatibility logger.warning("Using deprecated filepath parameter. Please use session_id instead.") full_path = get_excel_path(filepath) from xlwings_mcp.xlwings_impl.validation_xlw import validate_excel_range_xlw result = validate_excel_range_xlw(full_path, sheet_name, start_cell, end_cell) else: return ERROR_TEMPLATES['PARAMETER_MISSING'].format( param1='session_id', param2='filepath' ) return result.get("message", "Range validation completed") if "error" not in result else f"Error: {result['error']}" except (ValidationError, DataError) as e: return f"Error: {str(e)}" except Exception as e: logger.error(f"Error validating range: {e}") raise
• src/xlwings_mcp/xlwings_impl/validation_xlw.py:233-328 (handler)

  Primary xlwings implementation for validating Excel range (legacy filepath mode). Opens workbook, checks sheet/range existence, returns detailed range info including size and data presence.
  def validate_excel_range_xlw( filepath: str, sheet_name: str, start_cell: str, end_cell: str = None ) -> Dict[str, Any]: """ Validate if a range exists and is properly formatted using xlwings. Args: filepath: Path to Excel file sheet_name: Name of worksheet start_cell: Starting cell address end_cell: Ending cell address (optional) Returns: Dict containing validation result and range information """ app = None wb = None # Initialize COM for thread safety (Windows) _com_initialize() try: logger.info(f"Validating range {start_cell}:{end_cell or start_cell} in {sheet_name}") # Check if file exists if not os.path.exists(filepath): return {"error": f"File not found: {filepath}", "valid": False} # Open Excel app and workbook app = xw.App(visible=False, add_book=False) wb = app.books.open(filepath) # Check if sheet exists sheet_names = [s.name for s in wb.sheets] if sheet_name not in sheet_names: return {"error": f"Sheet '{sheet_name}' not found", "valid": False} sheet = wb.sheets[sheet_name] # Validate the range try: if end_cell: range_obj = sheet.range(f"{start_cell}:{end_cell}") else: range_obj = sheet.range(start_cell) # Get range information range_info = { "message": f"Range validation successful: {range_obj.address}", "valid": True, "range": range_obj.address, "start_cell": start_cell, "end_cell": end_cell, "rows": range_obj.rows.count, "columns": range_obj.columns.count, "size": range_obj.rows.count * range_obj.columns.count, "sheet": sheet_name, "has_data": bool(range_obj.value is not None) } # Check if range has any data if range_obj.value: if isinstance(range_obj.value, (list, tuple)): non_empty_count = sum(1 for row in range_obj.value if row and any(cell for cell in (row if isinstance(row, (list, tuple)) else [row]) if cell is not None)) else: non_empty_count = 1 if range_obj.value is not None else 0 range_info["non_empty_cells"] = non_empty_count else: range_info["non_empty_cells"] = 0 logger.info(f"✅ Range validation successful: {range_obj.address}") return range_info except Exception as range_error: return { "error": f"Invalid range: {range_error}", "valid": False, "start_cell": start_cell, "end_cell": end_cell, "sheet": sheet_name } except Exception as e: logger.error(f"Error validating range: {e}") return {"error": str(e), "valid": False} finally: if wb: wb.close() if app: app.quit()
• src/xlwings_mcp/xlwings_impl/validation_xlw.py:477-552 (helper)

  Session-based xlwings helper for Excel range validation using existing workbook object. Used by MCP handler for open sessions.
  def validate_excel_range_xlw_with_wb( wb, sheet_name: str, start_cell: str, end_cell: str = None ) -> Dict[str, Any]: """ Validate if a range exists and is properly formatted using xlwings with workbook object. Args: wb: xlwings Workbook object sheet_name: Name of worksheet start_cell: Starting cell address end_cell: Ending cell address (optional) Returns: Dict containing validation result and range information """ try: logger.info(f"🔍 Validating range {start_cell}:{end_cell or start_cell} in {sheet_name}") # Check if sheet exists sheet_names = [s.name for s in wb.sheets] if sheet_name not in sheet_names: return {"error": f"Sheet '{sheet_name}' not found", "valid": False} sheet = wb.sheets[sheet_name] # Validate the range try: if end_cell: range_obj = sheet.range(f"{start_cell}:{end_cell}") else: range_obj = sheet.range(start_cell) # Get range information range_info = { "message": f"Range validation successful: {range_obj.address}", "valid": True, "range": range_obj.address, "start_cell": start_cell, "end_cell": end_cell, "rows": range_obj.rows.count, "columns": range_obj.columns.count, "size": range_obj.rows.count * range_obj.columns.count, "sheet": sheet_name, "has_data": bool(range_obj.value is not None) } # Check if range has any data if range_obj.value: if isinstance(range_obj.value, (list, tuple)): non_empty_count = sum(1 for row in range_obj.value if row and any(cell for cell in (row if isinstance(row, (list, tuple)) else [row]) if cell is not None)) else: non_empty_count = 1 if range_obj.value is not None else 0 range_info["non_empty_cells"] = non_empty_count else: range_info["non_empty_cells"] = 0 logger.info(f"✅ Range validation successful: {range_obj.address}") return range_info except Exception as range_error: return { "error": f"Invalid range: {range_error}", "valid": False, "start_cell": start_cell, "end_cell": end_cell, "sheet": sheet_name } except Exception as e: logger.error(f"Error validating range: {e}") return {"error": str(e), "valid": False}