Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the readOnly/idempotent annotations, the description discloses ordering (newest first), the exact returned field set, the exclusion of dish details and other resources, and a non-obvious permission requirement with a caveat about old connections or older ChefBear apps lacking it. That permission caveat is the kind of context annotations cannot carry.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.