Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already flag destructiveHint=true and idempotentHint=true, so the safety profile is covered structurally. The description adds real value beyond that by disclosing cascading effects (media files are removed), the specific failure mode and error code for published posts, and the resulting external state (the live post remains on the platform). It does not address reversibility or required permissions, which keeps it off a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.