Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 0%, so description must add meaning. It provides format ('ISO 8601 string') which adds value beyond the bare schema, but does not explain the expected time range, relationship between start and end, or constraints. The parameter names are self-explanatory, limiting the need for extensive semantics.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.