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 does disclose that the tool returns the tail of each log, which is useful behavioral context beyond the schema. However, it does not mention whether this is a read-only operation, whether it triggers a cook, whether it only returns currently failed items or also historical failures, or what the response format looks like. The disclosed behavior is accurate but incomplete.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.