Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, openWorldHint=true. The description adds important behavioral context beyond annotations: accepting is irreversible, requires user confirmation, shares contact snapshots bidirectionally, and requires the accepting party to have at least one contact. It also mentions idempotent replay for repeated responses. However, it doesn't detail exactly what happens to the conversation or whether rejection notifies the other party, but the core irreversible and confirmation requirements are disclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.