Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
With only one parameter (roomId) and 0% schema description coverage, the description must compensate. It implies the roomId is necessary to identify the room but does not explain the format (e.g., UUID, string) or validity constraints, which could be an issue since the schema only says 'type: string'. Given the simplicity, a baseline of 4 is appropriate because the description at least ties the parameter to its purpose.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.