Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true. The description adds 'list all admins assigned to a specific partner role', which reiterates the read nature but does not disclose additional behaviors like pagination or response format. Value added is minimal but consistent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.