Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description adds nothing beyond that: it does not say what is returned (raw bytes, base64, text), how large files or binaries are handled, or what errors occur for a missing path or a directory. With annotations carrying the safety story, the remaining burden was return/content behavior, and it is unaddressed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.