Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden for behavioral disclosure. It only says 'run' tests but does not disclose what happens during execution (e.g., whether it launches a browser, how long it takes, whether it modifies any state, or what the output/return value looks like). This is minimal for a test-running tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.