Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It explicitly states 'READ-ONLY — does not actually spawn,' which is a key safety disclosure. It also explains the detection logic (conversion gaps, opportunity surface, saturation). However, it does not describe the return format or any other side effects, though the read-only nature is the most critical behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.