Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the burden. It states the tool lists event IDs, which implies a read operation. However, it does not specify the format of the output, whether the list is exhaustive or curated, or any side effects. For a simple listing tool, the description is minimally transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.