Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the transparency burden. It fully discloses the output: exactly 8 items, their fields, and the editorial ordering. The read-only nature is implied by 'Liste' but not explicitly stated, so it misses a little effectiveness despite strong return-value disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.