Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Without annotations, the description must convey behavioral traits. It states the tool is a list operation with no side effects, which is clear. However, it omits details like potential pagination, rate limits, or data freshness, leaving some ambiguity for a read operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.