Convert a SharePoint sharing link or document URL into stable driveId/itemId values. Call this once and reuse the IDs: sharing links can expire or be revoked, and resolving them costs an extra Graph round trip on every call.

List the worksheet names in a SharePoint-hosted Excel workbook.

Inspect a sheet without pulling its data: returns the column headers, the total row count, and up to 3 sample rows. Call this FIRST against an unfamiliar matrix so you can build a targeted filter for get_permission_matrix instead of pulling everything.

Read a worksheet as structured records, using the header row as keys. Note that maxRows/offset/filter/columns are applied AFTER the full sheet is fetched: they bound what you receive, not what is transferred. If the result is truncated, narrow it with filter or columns first, and only page with offset as a fallback.

Read raw values for an explicit A1 range, e.g. "A1:D20". Use when the sheet has a non-standard layout that the header-row model does not fit. Unlike get_permission_matrix, the range genuinely bounds what Graph transfers.