Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure, but it only says 'Switch the active profile.' It does not explain what happens to the previous active profile, whether the change is reversible, persists across sessions, or requires specific permissions. This lack of detail leaves the agent to infer side effects, which is risky for a mutating operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.