import type { TabSummary } from "../docs/tabs.js";
/**
 * List a Spreadsheet's sheets (identity only). Returns `[]` when the API
 * reports none — callers treat "unknown" as "not multi-sheet" rather than
 * blocking a write on a missing field.
 */
export declare function listSpreadsheetSheets(account: string, spreadsheetId: string): Promise<TabSummary[]>;