Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It only says 'Mark a task as completed' and calls it a shortcut, without explaining whether the operation is reversible, idempotent, what other fields are affected, whether permissions are required, or what response is returned. This is a notable gap for a mutation tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.