Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and delivers a meaningful disclosure: include_free=True admits non-ZDR ':free' variants whose prompts may be logged/trained on, and these require allow_non_zdr or the openrouter-free provider. That is real side-effect/privacy context beyond a simple getter.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.