Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full disclosure burden. It hints at statefulness ('so the session remembers what we already did') and mutation (writes buy cards, keeps a profile), but says nothing about permissions, side effects, reversibility, or what 'No screen' constrains. Disclosure is far short of what an unannotated mutation tool needs.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.