Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, so the description carries the full burden and does so: it enumerates every accepted status value (None, 'all', open, in_progress, resolved, closed), states the default, describes the limit range (1-100, default 20), and warns that other values error. This is meaning well beyond the raw schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.