Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of disclosing behavioral traits. It only states that it creates a conversation thread, but does not mention side effects, permissions, idempotency, or whether a conversation thread is distinct from a message. This leaves the agent without key information about the operation's implications.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.