Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The only parameter, event_slug, is described in the schema as 'Event slug from list_events.' The description adds value by repeating this and emphasizing the dependency on list_events, which aids understanding beyond the schema alone. With 100% schema coverage, baseline is 3, but the extra context justifies a 4.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.