Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden. It discloses a key behavioral trait: it refuses adult and blocked content. However, it doesn't explain the failure mode (error vs empty response), permissions, or rate limits. The legacy HTTP player mention hints at legacy nature but not its implications.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.