Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the readOnly/openWorld/idempotent annotations, it discloses keyless access, that it stores nothing, that payments settle on a public chain, and that hashes are independently verifiable without trusting the server. This adds materially useful trust and privacy context for a financial-history tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.