Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the baseline is 3; the description earns above baseline by explaining that account_address toggles an entirely different response mode rather than just filtering, and that position_id further narrows that mode. chain_id is left to the schema, which is reasonable.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.