Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden but only states the basic action. It doesn't disclose behavioral traits such as required permissions (e.g., write access), whether it overwrites existing directories, error handling (e.g., if path already exists), or side effects. This is inadequate for a mutation tool with zero 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.