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. It tells the agent that the project is saved, but does not mention that this overwrites the existing project file, may require write permissions, or what side effects occur. This is minimal transparency 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.