统一 Runtime Host、App Server 与 Agent GUI

Thread：一段持续对话
  └─ Turn：一次用户请求及随后的一轮工作
       └─ Item：用户消息 / 模型消息 / 工具执行 / 文件变更等

{"id":1,"method":"initialize","params":{"clientInfo":{"name":"interview_demo","version":"0.1.0"}}}

{"method":"initialized","params":{}}

{"id":2,"method":"thread/start","params":{}}

{"id":3,"method":"turn/start","params":{"threadId":"实际返回的线程ID","input":[{"type":"text","text":"先解释这个仓库的结构。"}]}}

codex app-server --listen ws://127.0.0.1:4500
# 在另一个终端连接同一宿主
codex --remote ws://127.0.0.1:4500

function reduce(state, event) {
  if (event.seq <= state.lastSeq) return state; // 已应用的事件不重放
  const next = {...state, lastSeq: event.seq};
  if (event.kind === "tool.started")
    next.tools = {...state.tools, [event.callId]: {status: "running"}};
  if (event.kind === "tool.completed")
    next.tools = {...state.tools, [event.callId]: {status: "completed", result: event.result}};
  if (event.kind === "steer.accepted") next.pendingUpdate = event.updateId;
  if (event.kind === "steer.applied") next.pendingUpdate = null;
  if (event.kind === "turn.completed") next.status = event.status;
  return next;
}