Add, rename, or delete a sheet (tab) within an existing Google Spreadsheet via a single batchUpdate call.

Documented steps

1. POST https://sheets.googleapis.com/v4/spreadsheets/{spreadsheetId}:batchUpdate with OAuth scope https://www.googleapis.com/auth/spreadsheets (or drive/drive.file); body: {"requests": [ ... ]}.
2. Add a tab with an AddSheetRequest: {"addSheet": {"properties": {"title": "New Tab"}}}. sheetId is optional and randomly generated if unset; read the assigned sheetId back from replies[].addSheet.properties.
3. Rename a tab with an UpdateSheetPropertiesRequest: {"updateSheetProperties": {"properties": {"sheetId": 123, "title": "Renamed"}, "fields": "title"}}. The fields FieldMask is required; list only the changed sub-fields (or "*" for all).
4. Delete a tab with a DeleteSheetRequest: {"deleteSheet": {"sheetId": 123}}. This uses the numeric sheetId, not the tab's title string.
5. All requests inside one batchUpdate are validated and applied atomically in order; if any single request is invalid, the entire call fails and nothing is applied.
6. Optionally set includeSpreadsheetInResponse: true to get the full updated Spreadsheet resource back in the same response instead of a separate spreadsheets.get call.
7. Docs: https://developers.google.com/workspace/sheets/api/reference/rest/v4/spreadsheets/batchUpdate | https://developers.google.com/workspace/sheets/api/reference/rest/v4/spreadsheets/request | https://developers.google.com/workspace/sheets/api/limits