Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the baseline is 3. The description adds value by explaining the query parameter's filtering behavior and illustrating with an example (search_indicators({dataset:"CPI", query:"united states"}) finds COUNTRY=USA). It also clarifies the effect of omitting the optional query parameter, going slightly beyond the schema's property descriptions.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.