Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and readOnlyHint=false, so the safety profile is covered structurally. The description adds the mutual-exclusivity constraint and the read-tasks-first prerequisite, but never warns that sending content overwrites the existing plan, which is the main destructive behavior an agent should know about.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.