Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry behavioral disclosure. The description 'Get project net classes' implies a read-only operation with no side effects, which is correct. However, it adds no extra context about behavior beyond the tool name, such as whether the output is formatted or paginated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.