Office Word MCP Server

Instructions

Implementation Reference

• word_document_server/tools/format_tools.py:550-608 (handler)

  Primary asynchronous handler implementing the tool logic: validates parameters, loads and saves the document, verifies table and cell indices, calls core helper, and returns formatted success/error message.

  async def set_table_cell_alignment(filename: str, table_index: int, row_index: int, col_index: int,
                                   horizontal: str = "left", vertical: str = "top") -> str:
      """Set text alignment for a specific table cell.
      
      Args:
          filename: Path to the Word document
          table_index: Index of the table (0-based)
          row_index: Row index (0-based)
          col_index: Column index (0-based)
          horizontal: Horizontal alignment ("left", "center", "right", "justify")
          vertical: Vertical alignment ("top", "center", "bottom")
      """
      filename = ensure_docx_extension(filename)
      
      # Ensure numeric parameters are the correct type
      try:
          table_index = int(table_index)
          row_index = int(row_index)
          col_index = int(col_index)
      except (ValueError, TypeError):
          return "Invalid parameter: table_index, row_index, and col_index must be integers"
      
      # Validate alignment parameters
      valid_horizontal = ["left", "center", "right", "justify"]
      valid_vertical = ["top", "center", "bottom"]
      
      if horizontal.lower() not in valid_horizontal:
          return f"Invalid horizontal alignment. Valid options: {', '.join(valid_horizontal)}"
      
      if vertical.lower() not in valid_vertical:
          return f"Invalid vertical alignment. Valid options: {', '.join(valid_vertical)}"
      
      if not os.path.exists(filename):
          return f"Document {filename} does not exist"
      
      # Check if file is writeable
      is_writeable, error_message = check_file_writeable(filename)
      if not is_writeable:
          return f"Cannot modify document: {error_message}. Consider creating a copy first."
      
      try:
          doc = Document(filename)
          
          # Validate table index
          if table_index < 0 or table_index >= len(doc.tables):
              return f"Invalid table index. Document has {len(doc.tables)} tables (0-{len(doc.tables)-1})."
          
          table = doc.tables[table_index]
          
          # Apply cell alignment
          success = set_cell_alignment_by_position(table, row_index, col_index, horizontal, vertical)
          
          if success:
              doc.save(filename)
              return f"Cell alignment set successfully for table {table_index}, cell ({row_index},{col_index}) to {horizontal}/{vertical}."
          else:
              return f"Failed to set cell alignment. Check that indices are valid."
      except Exception as e:
          return f"Failed to set cell alignment: {str(e)}"

• word_document_server/main.py:273-277 (registration)

  MCP tool registration using FastMCP @mcp.tool() decorator. Provides synchronous wrapper with argument types and docstring schema, delegating to the async handler in format_tools.

  @mcp.tool()
  def set_table_cell_alignment(filename: str, table_index: int, row_index: int, col_index: int,
                             horizontal: str = "left", vertical: str = "top"):
      """Set text alignment for a specific table cell."""
      return format_tools.set_table_cell_alignment(filename, table_index, row_index, col_index, horizontal, vertical)

• word_document_server/core/tables.py:410-433 (helper)

  Core helper function that validates row/col indices, retrieves the target table cell, and applies alignment via low-level set_cell_alignment function.

  def set_cell_alignment_by_position(table, row_index, col_index, horizontal="left", vertical="top"):
      """
      Set text alignment for a specific cell by position.
      
      Args:
          table: The table containing the cell
          row_index: Row index (0-based)
          col_index: Column index (0-based)
          horizontal: Horizontal alignment ("left", "center", "right", "justify")
          vertical: Vertical alignment ("top", "center", "bottom")
          
      Returns:
          True if successful, False otherwise
      """
      try:
          if (0 <= row_index < len(table.rows) and 
              0 <= col_index < len(table.rows[row_index].cells)):
              cell = table.rows[row_index].cells[col_index]
              return set_cell_alignment(cell, horizontal, vertical)
          else:
              return False
      except Exception as e:
          print(f"Error setting cell alignment by position: {e}")
          return False