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. 'Get' clearly indicates a read operation, and 'full details' suggests the complete epic object is returned. However, it does not state that it is read-only, what happens if the epic is not found, or any error conditions. No additional behavioral traits are disclosed beyond what is obvious from the verb.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.