Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide readOnlyHint=true, so the agent knows this is a safe read. The description adds a small detail (returns bucket name and HTTP response settings) but doesn't describe the response format, whether it returns all settings or a subset, or whether the bucket must exist. With readOnlyHint present, the bar is lower, and the description adds modest context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.