Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description is responsible for conveying behavior. It adds the endpoint reference and the wildcard syntax detail, which partially covers this. However, it doesn't explain what the returned list contains (filenames? full paths?), whether ordering is guaranteed, whether hidden files are included, or what happens if no wildcards exist (empty list?). For a zero-param tool with no annotations, this is adequate but not rich context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.