Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotations already declare readOnlyHint=true, destructiveHint=false, idempotentHint=true, so the non-mutating nature is covered by structured data. The phrase 'Cascade preview' weakly implies a dry-run of cascade effects, which is a small addition, but it says nothing about what the preview returns, how deep the cascade is computed, or whether there are side effects. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.