Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the baseline is 3. The description adds conceptual meaning by tying 'one locale or up to 10 configured locales' to language and localeLimit, and 'bounded scan' to scanLimit, which helps an agent reason about parameter behavior beyond the raw schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.