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. 'Get available dartboards' implies a read-only operation, but it doesn't specify what 'available' means (e.g., accessible vs. all), whether it requires authentication, rate limits, pagination, or the return format. This leaves significant gaps for a tool with no annotation coverage.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.