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 enhances parameter meaning by grouping filters ('time, value and address filters') and providing a concrete example ('all native transfers in the last 24 hours above a given XGR/wei amount') that implies how to combine fromTimestamp, minValueWei, etc. This adds value beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.