Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral disclosure burden. It states the destructive action and the zero-based index, and mentions the return value, but it does not disclose side effects such as reindexing of remaining slides, irreversibility, or error behavior. The core behavior is clear, but context is minimal.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.