Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is only 33% (only content described), but the description adds meaning: content is text, requires an agent key, and the mission must correspond to the caller's role. It doesn't fully explain how to obtain agent_key/mission_id, though sibling tools like list_missions and get_my_status cover discovery.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.