Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It discloses that the tool creates and selects a model, which implies mutation and side effects. However, it does not mention failure behavior, permissions, or whether it overwrites existing models, though the simplicity of the operation makes this less critical.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.