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, so the safety profile is covered without the description. The description adds no behavioral context of its own — nothing about whether the response is a binary file stream, how the id scopes the export, or whether the export reflects current or published state.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.