Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the burden of behavioral disclosure. It transparently explains the response contents: client, user, report-section scopes with possible values, outreach-lead marking ability, and own-leads-only restriction. It does not explicitly state that the operation is read-only, but the phrasing 'who this API key belongs to' strongly implies introspection with no side effects.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.