Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description fully carries the burden of behavioral disclosure. It states the tool is free, performs a read-only query (checking records), and returns specific data (hazard + units). It does not mention side effects or authorization needs, but the read-only nature is clear. The description adds value beyond the input schema.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.