Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and says nothing about whether the removal is idempotent, what happens if the tool was never preferred, or whether the change is persisted or per-session. 'Remove' implies mutation but no consequences are disclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.