Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, but the description adds crucial meaning by stating 'id=proposal', clarifying that the generic 'Resource ID' parameter is specifically a proposal ID. This goes beyond the schema's generic description and helps the agent pass the correct ID. Other parameters are covered by the schema, so the description's contribution is meaningful but not exhaustive.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.