Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full responsibility for behavioral disclosure. It merely says 'Get all OSGi services' without stating that it is read-only, what the return format is, whether it requires special permissions, or any potential side effects. This is insufficient for a transparent contract.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.