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 implies a read-only calculation of stats but does not explicitly state whether the tool reads a file, has side effects, requires specific file formats, or returns a structure. It gives no information about permissions, resource access, or error behavior, leaving the agent to guess.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.