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. It only says 'Login' without describing side effects (e.g., opening a browser, storing credentials, or requiring user interaction). No details about the authentication flow or potential configuration changes are given.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.