Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
With 0% schema description coverage, the description carries the semantic burden and partially pays it: 'expected revision' explains the purpose of expected_revision, and 'complete task plan' implies the tasks array is a full replacement rather than a delta. However, the project_id/request_id/session_id triplet and the TaskDefinition fields (status, depends_on, supersedes) are left to name inference alone.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.