Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive, so the safety bar is low. The description adds real behavioral context: default scope is all authorized workspaces, results are grouped by workspace, output is bounded, and cursor must be reused with the same workspace selection and query.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.