Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden for behavioral disclosure. 'Generate CLI integration tests' only conveys a create/write action; it does not explain whether files are scaffolded, whether existing files are overwritten, what api_key is used for, or what output is produced.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.