Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has zero parameters and schema description coverage is 100%, so the schema is trivially complete. The description adds context by noting that the calculator itself has inputs with units, ranges, and defaults, which is useful for agents inspecting the calculator. The baseline of 4 for zero-parameter tools is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.