Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must disclose side effects or behavioral traits, but it only says 'import' into the current project. It does not state whether this replaces, appends, or modifies existing timeline data, what permissions are needed, or what happens to the project state.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.