Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema provides complete descriptions for all three parameters (period, group_by, workspace), achieving 100% coverage. The description references provider/model/time period, which maps to the group_by and period parameters, but does not add new semantic details beyond the schema. Baseline of 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.