Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full disclosure burden, and it does add meaningful context: credentials are removed from 'this computer' (local credential store), not merely a server-side session. However, it does not say whether the server session is invalidated, what happens if no credentials are saved, or whether an error is surfaced — significant gaps for a credential-destroying operation with zero annotation coverage.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.