Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false. The description adds useful context beyond those annotations: it is private, free, keyless, and requires nothing to sign. It also explains that it records externally stated next steps rather than generating clinical recommendations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.