Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must disclose behavior, but it only mentions jargon like 'fill E' and 'fallback only' without explaining what the tool does, what side effects it has, or what it returns. This is a significant gap for a tool that likely performs computation or formatting.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.