Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly/non-destructive and closed-world, so the safety profile is covered. The description adds real behavioral context beyond that: it discloses that sources are resolved from a cloud catalog via vercel_project, argocd_*, and deployment_sources JSON, and that scope=auto fans out across all configured sources — useful for understanding what a call actually touches.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.