Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, but the description adds non-obvious behavior: it returns a playbook, and share_report files only diagnostics plus the caller's text. That privacy/scope disclosure is real value beyond the structured fields. It does not, however, describe latency or what the playbook contains, so it is not exhaustive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.