Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 50%: 'directory' is documented as 'Project directory' in the schema, but 'api_key' has no description anywhere. The tool description adds zero parameter-level meaning and never mentions api_key, leaving an agent unable to determine whether api_key is needed for Pro validation, is optional, or what format it should take. At 50% coverage, the description needed to compensate for the undocumented parameter and did not.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.