Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It does disclose the specific behavioral focus (checking for missing %e in mysql_format), which is useful. However, it does not state whether the scan is read-only, whether it scans the entire script or only relevant sections, or what the output looks like.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.