Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It only states 'List all bookmarks' without mentioning whether authentication is required, if any side effects occur, or what the return format looks like. While 'List' implies a read-only operation, no additional behavioral context is given.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.