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 only says 'Activate a plugin' without detailing whether it requires specific permissions, changes the database, or what happens if the plugin is already active. This is insufficient for an action-oriented tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.