Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations indicate this is a mutating operation (readOnlyHint=false, destructiveHint=false, idempotentHint=false), but the description adds no behavioral context beyond 'uploads a file to the remote host.' It does not disclose whether existing files are overwritten, how content is encoded, whether a session is required, or what side effects occur. With only annotations carrying the burdenuation, this is insufficient for an upload operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.