Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered; the description's 'Read-only' merely repeats it. The pagination/cursor behavior is disclosed, but that fact is also present in the schema, so added behavioral value is thin, though nothing is contradicted.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.