Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full disclosure burden. It explicitly enumerates the response fields (provider, subscribed symbols, connection uptime, tick/bar counters, last error), which is a substantive behavioral disclosure. It doesn't mention side effects or rate limits, but for a status query, the description is adequately transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.