Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Adds real context beyond the annotations: data comes from a periodically regenerated mirror off the public ledger rather than asserted on the vendor's own authority, and the response states its generation timestamp — meaningful freshness/provenance disclosure for a governance read. Cost and keyless auth are also stated. Annotation coverage already establishes read-only/idempotent safety, so this is additive rather than load-bearing.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.