Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover the safety profile (readOnly, non-destructive, openWorld), but the description adds the crucial non-annotation fact that this is a paid call costing 0.010 USDC, plus the fact that it inspects untrusted token metadata for prompt injection. It does not mention rate limits, failure modes, or what happens if the address is not a Base contract, which keeps it short of 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.