Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It only says 'update', implying mutation, but fails to disclose whether it performs a partial or full replacement, what happens to omitted fields, or any side effects like triggering runs. The schema suggests partial updates via optional fields, but this is not explicitly stated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.