Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world, covering the safety profile. The description adds a genuinely useful extra trait ('without storing them'), signaling a stateless/non-persisting operation, and notes the graph is 'bounded', but says nothing about output shape or processing limits.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.