Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The readOnlyHint annotation already covers safety, and the description adds meaningful context by specifying output format (Markdown) and contents (sections, FAQ, official sources with URLs). It also explains the purpose of sources for verification. There is no contradiction with annotations, and the description exceeds baseline by providing these details.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.