Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden. It discloses key behavioral traits: it performs PII detection (not anonymization), returns JSON with specific fields, and includes optional detailed decision process. However, it doesn't cover rate limits, authentication needs, or error handling, leaving gaps for a mutation-like analysis tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.