Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It discloses access_token caching behavior, returns a JSON string with location data, and implies a read-only search operation. While it doesn't mention rate limits or pagination, it provides solid transparency for a search tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.