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 all three parameters as UUID value wrappers. The description adds context about the roles of the parameters (fromUserId is the demo user, toUserId is the real user, sessionId identifies the demo session) but does not provide detailed semantics beyond what the schema and description together imply. Baseline 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.