Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden for behavioral disclosure, but it only restates the name. It does not mention whether pinning is reversible, what happens to previously pinned items, or any permission requirements. This leaves the agent blind to essential behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.