Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The word 'diff' weakly suggests a comparison behavior, but the description adds no real context about side effects, scoping, or what the diff is against beyond what annotations supply, so it stays near baseline.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.