Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% with a clear description of the 'target' parameter. The tool description adds no extra parameter meaning, but since the tool does nothing, parameter semantics are moot. The baseline score applies because the schema already documents the parameter adequately, though the description does not compensate for the fact the parameter is useless in practice.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.