Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so safety profile is covered. The description adds only the route, revealing that keys are project-scoped, but says nothing about whether deletion is permanent, whether access is revoked immediately, or what happens to anything referencing the key.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.