Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, including the nested profile fields (location, industries, description, capabilities, company_name) and the day/limit defaults, so the schema does the heavy lifting. The description only adds that the profile is inline and per-call, which the schema already states, so baseline 3 is correct.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.