Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema has zero parameters, so schema coverage is 100% by default. The description adds the essential meaning that the tool lists 'product suppliers,' which clarifies the purpose beyond the empty schema. With no parameters, the description must convey what the tool retrieves, which it does, albeit minimally.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.