Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of behavioral disclosure. It usefully discloses that only allowlisted npm scripts can be run and that arbitrary commands are rejected, which is important safety-relevant behavior. However, it does not mention whether the script may modify files, what output or exit codes are returned, or any permission/prerequisite requirements, leaving notable transparency gaps for an execution tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.