Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden for behavioral disclosure. It only states the action (mark resolved) but does not reveal side effects: whether it is reversible, whether it deletes or hides the note, whether it requires certain permissions, or if it affects the associated task status. This is significant 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.