Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure. It states the tool inspects the viewport but doesn't describe what 'inspect' entails operationally (e.g., returns a screenshot, text description, or structured data), whether it's read-only or has side effects, latency characteristics, or error conditions. For a tool with zero annotation coverage, this leaves significant behavioral gaps.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.