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. 'Shows the working tree status' implies a read-only operation, but doesn't specify what information is included (staged vs unstaged changes, untracked files, branch information), the output format, or any limitations. This is inadequate for a tool with zero annotation coverage.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.