Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations, so the description carries the burden, and it clearly signals a read-only inspection ('Read this project's git state'). It discloses the scope of returned data and its role as a pre-flight check, though it says nothing about permissions or behavior when the project has no repo/remote configured.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.