Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden, but it only restates the tool's purpose ('get metadata and statistics') without disclosing any behavioral traits such as return format, read-only guarantee, error scenarios, or rate limits. This is a minimal, non-informative statement.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.