Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It does disclose the dual like/unlike behavior and that the unlike parameter exists for backward compatibility, which is meaningful. However, it omits side effects such as idempotency, repeated calls, permission needs, or what happens when unliking an already-unliked post.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.