Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide comprehensive behavioral hints (readOnlyHint: true, destructiveHint: false, idempotentHint: true, openWorldHint: true), which already tell the agent this is a safe, non-destructive, repeatable read operation. The description adds minimal value by mentioning '(GET)' which aligns with readOnlyHint, but doesn't provide additional behavioral context like what kind of data is returned, error conditions, or rate limits. No contradiction with annotations exists.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.