Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the behavioral disclosure burden. It discloses that no API key is required, that results are untrusted community data, and that embedded commands should never be auto-executed. This is meaningful behavioral and security context beyond what the name and schema provide.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.