Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% with examples, enums, and per-field descriptions, so baseline is 3. The description's only added value over the schema is the cross-reference 'as lookup_company', which is a minor semantic link rather than new format or syntax detail.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.