Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry this burden, but it only states the action. It does not disclose whether the query returns results, how it handles errors, rate limits, or side effects. It implies a read-only operation but does not confirm or provide additional behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.