Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, openWorldHint=true, destructiveHint=false, idempotentHint=false, so the safety profile is largely covered. The description adds one genuinely useful behavioral fact — output stays local and is never publicly uploaded — which resolves the ambiguity of openWorldHint=true, but it omits where the file is written, overwrite behavior, and whether it requires auth.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.