Scored across 31 tools
Most tools have clearly distinct resource+action boundaries, and the block/cell split is explained well. A few pairs could cause misselection—set_cells vs set_block_cells, describe_block(include_rows) vs get_cells, and chart_insert vs chart_from_block—but the descriptions do enough to disambiguate them.
The dominant verb_noun pattern (create_block, set_field_rule, add_block_rows) is consistent and predictable. The chart tools break it with noun_verb names (chart_list, chart_update, chart_delete), and chart_insert/chart_from_block sit awkwardly together, creating minor but noticeable deviations.
At 31 tools this crosses the 'too many' threshold, even though the tools cluster into coherent groups like charts, pivots, blocks, and diagnostics. Several chart-related tools could be consolidated, and the surface is heavy for an agent to hold and route between in context.
The surface covers the full spreadsheet workflow well: workbook lifecycle, block CRUD, cell access, formulas, charts, pivots, analysis blocks, validation, and even dependency tracing and goal seeking. Minor gaps exist—no delete_block or delete_sheet, no explicit sheet listing, and no formatting/rename operations—but agents can work around them.