Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden, and it does so well: it discloses cost, payment rails, expiration, 24-hour renewal, OFAC screening, and the fact that the same payment cannot be credited twice. This goes well beyond a bare 'creates clearance' statement and gives an agent a realistic picture of side effects and prerequisites.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.