Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden and does not meet it. It implies a mutating build operation with side effects (generating project files via xcodegen, writing build artifacts) but says nothing about permissions, duration, failure modes, or whether it modifies the workspace.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.