Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the schema already documents id, start, and end, including the YYYY-MM-DD format and end-after-start requirement. The description reinforces start-inclusive and end-exclusive semantics but does not add substantial parameter meaning beyond the structured schema, so the baseline 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.