Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false and openWorldHint=true, so the safety profile is covered. The description adds nothing on top: it does not explain that this is a merge-style partial update (unspecified fields left untouched), whether referenced related objects are overwritten, or what permissions are required — context that matters for a PATCH tool with idempotentHint=false.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.