Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint; the description's 只读工具 simply restates that. It does add one genuinely useful scoping fact — results are limited to the user owning the current API key — but says nothing about return shape, pagination, or rate limits beyond what annotations cover.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.