Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Adds useful context beyond the readOnly and idempotent hints by stating that search results are annotated with provenance, stale, and conflict status. It doesn't cover pagination or default filtering, but the safety profile is already established by annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.