多 Agent 协作 / Multi-Agent Coordination

说明（zh）：嵌套场景下父 Agent 通过 AgentTool 启动子 Agent，子体使用受限工具集，侧链 transcript 与主会话隔离。Swarm 式协作中 Leader 通过文件邮箱向 Worker 分派任务，权限状态在参与者间同步。

Notes (en): Nesting: the parent invokes AgentTool to spawn a child with a restricted tool allow-list and an isolated sidechain transcript. Swarm-style: a leader uses a file mailbox to assign work to workers, with permission state kept in sync across participants.