Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% with a clear description for the 'key' parameter, giving a baseline of 3. The description adds the semantic constraint that the memory must be 'previously stored,' implying the key must reference an existing memory, which provides extra meaning beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.