Does the description explain when to use this tool, when not to, or what alternatives exist?
It says exactly when to resolve ('only when no blocked task becomes invisible') and when not to: 'A blocked task's final task_block/operator_action cannot be acknowledged.' It explicitly names alternatives ('typed retry, platform-policy resolution, replan, close, or supersede operation'), which maps to sibling tools.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.