Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full transparency burden. It discloses parameter defaults, state format, limit constraints, and the role of api_key in raising rate limits, which is useful operational context. However, it does not explicitly state this is a read-only operation, nor does it mention response ordering, error behavior, or any prerequisites beyond the optional API key.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.