Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the transparency burden. It discloses what the output includes (article counts, AI overview themes) but does not explicitly state side effects, authentication, or scope limitations (e.g., read-only). For a list tool, the mutability is implied as low, but the description could be more explicit about any filters or pagination.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.