Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=false, so safety and scope are covered structurally. The description adds real value with the note that the first founding wish stays sealed and that discounts, queue position, and an invite link are included. It says nothing, though, about authorization, what happens with an invalid or expired token, or whether the data is the caller's own versus another person's.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.