Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotations provide comprehensive behavioral information (read-only, non-destructive, idempotent, open-world), so the description doesn't need to repeat these. However, the description adds minimal value beyond annotations - it only indicates this is a GET operation, which is already implied by readOnlyHint. It doesn't provide any additional context about what 'allForPermissions' means behaviorally, such as what data is returned or how permissions are structured.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.