Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. While 'Adds' implies a mutation/write operation, it doesn't specify permissions required, whether the operation is idempotent, what happens on duplicate adds, or any error conditions. This leaves significant behavioral gaps for a tool that modifies system state.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.