Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so both parameters are already documented, giving a baseline of 3. The description does add value by enumerating the asset classes (retail, office, industrial), partially compensating for the enum-less property_type field, but gives no format or granularity detail for city_or_postcode.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.