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. It states what information is retrieved but doesn't describe how the data is sourced (e.g., from an API endpoint, cached values), whether it requires authentication, potential rate limits on this call itself, or the format of the returned data. For a tool with zero annotation coverage, this leaves significant gaps in understanding its behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.