Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema has 100% description coverage, with the 'cid' parameter clearly documented as 'PubChem Compound ID (CID)' of type number or string. The description adds no additional meaning beyond this, as it does not elaborate on parameter usage, constraints, or examples. Given the high schema coverage, a baseline score of 3 is appropriate, as the schema adequately handles parameter semantics without extra description value.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.