Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure, and it does well: it states authentication requirements (ChainHelix API key as bearer token), per-call costs with payment methods, ordering ('most active first'), and window constraints (default 168, max 2160). It does not mention rate limits or failure behavior, but the key operational traits are covered.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.