Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnlyHint=false, destructiveHint=false, idempotentHint=true. The description adds that the tool updates an existing tag, which is consistent. However, it does not disclose additional behavioral traits beyond what annotations provide, so it adds limited value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.