Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema has 100% description coverage, with the single parameter 'role' documented as 'The ARIA role name'. The description adds an example ('e.g., list requires listitem') that illustrates the parameter's semantics, providing context beyond the schema. However, it does not elaborate on format, validation, or edge cases, so it meets the baseline for high schema coverage without substantial extra value.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.