Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is high: the schema defines action, node, depth, project, source, relation, and target with patterns, enums, defaults, and bounds. The description only adds the concepts of boundedness and relationship addition, without naming or explaining parameter semantics. This meets the baseline for high schema coverage.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.