Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden. It discloses output format differences (JSON for Google, Markdown for Bing/Yandex), which is useful behavioral context. However, it doesn't mention rate limits, authentication needs, error handling, or what 'simultaneously' entails (parallel vs sequential). For a batch operation tool, this leaves significant gaps in understanding its behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.