Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema declares zero formal parameters, so the baseline is 4, but the description's 'by name' implies an undocumented parameter for the effect name. The agent cannot determine how to specify that name (e.g., property key, value format), so the description only partially compensates for the schema's silence.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.