Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. 'Convert' implies a transformation operation, but it doesn't disclose whether this is read-only or destructive, what permissions are needed, whether it handles large files, what happens on failure, or what the output format looks like. The description adds minimal behavioral context beyond the basic operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.