Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the full burden of behavioral disclosure. It says 'pull and process new files' but does not disclose side effects such as whether files are moved, deleted, marked as processed, or whether the operation is idempotent. This is a significant gap for a tool that obviously mutates state on an external share.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.