Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It only states the action without any side effects, blocking behavior, or requirements (e.g., whether it opens a new window, requires an existing project, or modifies any files). This is insufficient for an agent to predict the tool's impact.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.