Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must carry the full burden of behavioral disclosure. It indicates a mutation ('set') but does not disclose whether the change persists, affects only the current session, requires specific privileges, or what happens to existing options. No side effects or usage details are mentioned.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.