Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, and the description's '(read-only)' merely repeats that. It adds nothing about what statuses can be returned, whether it errors on unknown markets, or how the resolution lifecycle is represented.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.