Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint. The description adds useful context about the apps being pre-configured (no local setup/API key needed) and provides an example URL. While it doesn't detail return structure, the output schema exists, so the description sufficiently complements the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.