Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations present, the description carries full responsibility for disclosing behavioral traits. It merely states 'List events for a project' without revealing any behavioral details such as pagination, ordering, filtering, rate limits, or side effects. This is insufficient for an agent to understand the tool's behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.