Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, which already convey safety. The description adds no behavioral context beyond the title—e.g., it doesn't explain what 'availability' means (returns a boolean? error if not available?), what gets checked (e.g., rate limits, data freshness), or the response format. With strong annotations, the bar is lower, but the description still fails to add meaningful transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.