Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden but offers minimal behavioral information. It states it retrieves a list but doesn't disclose pagination behavior, authentication requirements, rate limits, error conditions, or what 'curso configurado' means operationally. The description doesn't contradict annotations (none exist), but provides inadequate behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.