Google Sheets authoring

Two coordinate systems, on purpose

• VALUE tools (read_range, write_range, append_rows, clear_range) address a TAB TITLE plus A1 cells: {sheet: "Data", cells: "A1:B4"}.
• STRUCTURE/FORMAT tools (format_cells, set_borders, merge_cells, add_chart, add_conditional_formatting, insert_rows_or_columns, delete_rows_or_columns, freeze_rows_or_columns, sort_range, set_data_validation, set_basic_filter, add_banding, set_column_width, rename_sheet_tab, delete_sheet_tab) address the numeric sheetId.

get_spreadsheet returns both (each tab's title AND sheetId) with no cell data - call it first and keep the mapping. A new tab's sheetId is in add_sheet_tab's reply (replies[0].addSheet.properties.sheetId).

Sequencing a styled sheet: values first, then format, chart last