Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description bears the full burden of behavioral disclosure, but only restates the basic action. It doesn't mention side effects, whether events are cleared on retrieval, how 'recent' is defined, or the source/scope of the events. This leaves the agent unaware of important behavioral nuances.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.