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. While 'check' implies a read-only operation, it doesn't specify whether this requires special permissions, what format the health information returns, whether it includes performance metrics or just binary status, or if it has any rate limits. For a health monitoring tool with zero annotation coverage, this leaves significant behavioral questions unanswered.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.