Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the burden, and it does add a meaningful behavioral trait: this tool does not activate streams. It also implies a read-only, informational function by focusing on 'informações e contatos,' which is adequate for a low-risk lookup tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.