Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema descriptions cover 100% of parameters, but they are generic and unrelated to robots.txt ('HTTPS URL to normalize or cite', 'JSON text to validate; discarded after the check', 'IANA timezone name'). The tool description adds no mapping from url/host/json/zone to the fetch-and-count operation, so an agent cannot determine how the parameters relate to the stated purpose.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.