Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true, and destructiveHint=false. The description adds that it 'returns standard text + cross-references', which is useful context about the output. It does not contradict annotations, but it also doesn't disclose additional behavioral traits like error handling or rate limits. Given annotations cover the safety profile, the description adds modest value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.