Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered structurally. The description adds some value by characterizing what is returned (slides and texts as markdown, or complete content as json), but says nothing about permissions actually required, size limits, or behavior on a non-existent version number.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.