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 only states 'Save a DOCX document' without mentioning whether it overwrites existing files, what happens if 'path' is omitted, whether it persists to disk or memory, or what the tool returns (e.g., success status, base64 data). This is a significant gap for a mutating operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.