Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full behavioral burden. It states the action (copying text) but does not disclose side effects like overwriting existing clipboard content or any platform-specific requirements beyond 'macOS.' For a simple mutation tool, this is acceptable but not fully transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.