Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover the safety profile (readOnlyHint=true, destructiveHint=false, openWorldHint=false), and the description adds genuinely new context: free during validation, no key/credits/wallet required, and the 20-offer cap. It does not explain what happens when no valid pack combination exists for the required count, which would be useful for a solver.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.