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. 'Save a SQL query' implies a write operation that creates a persistent resource, but it doesn't disclose critical behaviors: whether this requires specific permissions, if saved queries can be overwritten, what happens on duplicate labels, rate limits, or what the output contains. For a mutation tool with zero annotation coverage, this is a significant gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.