Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare it is non-read-only, open-world, non-idempotent and non-destructive, so the safety profile is covered. The description adds essentially nothing beyond that — it does not say what happens after publication, whether the mission is publicly visible, or what auth/permission implications the agent_api_key carries.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.