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@cloudbase/agent-server

v0.0.24

Published

将 AG-UI 兼容的 Agent 部署为 HTTP 服务。

Readme

@cloudbase/agent-server

将 AG-UI 兼容的 Agent 部署为 HTTP 服务。

什么是 AG-UI?

AG-UI 是一个开放、轻量级、基于事件的协议,用于标准化 AI Agent 与用户界面的交互。它让 Agent 可以:

  • 实时流式对话
  • 双向状态同步
  • 前端工具集成(Client Tools)
  • 人机协作(Human-in-the-loop)

这个包解决什么问题?

  • 快速部署 Agent 为 HTTP 服务:一行代码将 Agent 部署为支持 AG-UI 协议的 HTTP 服务
  • 多端点支持:自动创建 /send-message/healthz 等端点
  • 云函数兼容:自动适配腾讯云开发 HTTP 云函数环境

架构图

flowchart LR
    Client[AG-UI 客户端] -->|AG-UI 协议| Server["@cloudbase/agent-server"]
    Server --> Adapter[Adapter<br/>LangGraph / LangChain]
    Adapter --> Agent[Agent 框架]

配合使用

| 包名 | 作用 | |------|------| | @cloudbase/agent-adapter-langgraph | LangGraph 工作流适配器 | | @cloudbase/agent-adapter-langchain | LangChain Agent 适配器 | | express | HTTP 服务框架 |

安装

pnpm add @cloudbase/agent-server express

快速开始

方式一:使用 run(最简单)

import { run } from "@cloudbase/agent-server";
import { LanggraphAgent } from "@cloudbase/agent-adapter-langgraph";
import { workflow } from "./workflow.js"; // 你的 LangGraph 工作流

run({
  createAgent: () => ({
    agent: new LanggraphAgent({ workflow }),
  }),
  port: 9000,
});

方式二:使用 createExpressServer

创建一个配置好的 Express 应用:

import { createExpressServer } from "@cloudbase/agent-server";
import { LanggraphAgent } from "@cloudbase/agent-adapter-langgraph";
import { workflow } from "./workflow.js";

const app = createExpressServer({
  createAgent: () => ({
    agent: new LanggraphAgent({ workflow }),
  }),
});

app.listen(9000, () => console.log("Listening on 9000!"));

方式三:使用 createExpressRoutes

将路由挂载到现有的 Express 应用:

import { createExpressRoutes } from "@cloudbase/agent-server";
import { LanggraphAgent } from "@cloudbase/agent-adapter-langgraph";
import { workflow } from "./workflow.js";
import express from "express";

const app = express();

createExpressRoutes({
  createAgent: () => ({
    agent: new LanggraphAgent({ workflow }),
  }),
  express: app,
});

app.listen(9000, () => console.log("Listening on 9000!"));

API 参考

run

创建并启动 HTTP 服务。

run({
  createAgent,
  port: 9000,
});

参数:

| 参数 | 类型 | 说明 | |------|------|------| | createAgent | AgentCreator | Agent 创建函数,见下方说明 | | port | number \| string | 监听端口 | | basePath | string | 可选,路由基础路径,默认为 /,云函数环境默认为 /v1/aibot/bots/:agentId/ | | cors | boolean \| CorsOptions | 可选,CORS 配置,默认启用 | | logger | Logger | 可选,日志实例,用于记录服务端日志 |

createExpressServer

创建一个配置好的 Express 应用。

const app = createExpressServer({
  createAgent,
  cors: true,       // 可选,默认启用 CORS
});

参数:

| 参数 | 类型 | 说明 | |------|------|------| | createAgent | AgentCreator | Agent 创建函数,见下方说明 | | basePath | string | 可选,路由基础路径 | | cors | boolean \| CorsOptions | 可选,CORS 配置,默认启用 | | logger | Logger | 可选,日志实例,用于记录服务端日志 |

createExpressRoutes

将 AG-UI 路由挂载到现有的 Express 应用。

createExpressRoutes({
  createAgent,
  express: app,
  basePath,         // 可选
});

参数:

| 参数 | 类型 | 说明 | |------|------|------| | createAgent | AgentCreator | Agent 创建函数,见下方说明 | | express | Express | Express 应用实例 | | basePath | string | 可选,路由基础路径,默认为 /,云函数环境默认为 /v1/aibot/bots/:agentId/ | | logger | Logger | 可选,日志实例,用于记录服务端日志 |

自动创建的端点

| 端点 | 说明 | |------|------| | {basePath}send-message | AG-UI 消息发送端点 | | {basePath}healthz | 健康检查端点 |

createAgent 参数

createAgent 返回一个对象:

  • agent:符合 AG-UI 协议 的 Agent
  • cleanup:可选,请求结束后的清理函数
type AgentCreator = (context?: {
  request: Request;     // 当前 HTTP 请求(Web Standard Request)
  logger?: Logger;      // 日志实例(带 requestId 上下文)
  requestId?: string;   // 请求追踪 ID
}) => AgentCreatorResult | Promise<AgentCreatorResult>; // 支持异步

type AgentCreatorResult = {
  agent: AbstractAgent | { toAGUIAgent(): AbstractAgent }; // AG-UI 兼容的 Agent
  cleanup?: () => void; // 可选,清理函数
};

使用适配器将你的 Agent 框架转换为 AG-UI 兼容的 Agent:

| 适配器 | 包名 | 说明 | |--------|------|------| | LanggraphAgent | @cloudbase/agent-adapter-langgraph | LangGraph 工作流适配器 | | LangchainAgent | @cloudbase/agent-adapter-langchain | LangChain Agent 适配器 |

import { LanggraphAgent } from "@cloudbase/agent-adapter-langgraph";

createAgent: () => ({
  agent: new LanggraphAgent({ workflow }),
})

高级用法: createAgent 可以接收请求上下文,也支持异步:

createAgent: async (context) => {
  console.log("Request ID:", context.requestId);
  return { agent: new LanggraphAgent({ workflow }) };
}

Logger

logger 参数用于记录服务端日志。需要实现以下接口:

interface Logger {
  info?(message: string): void;
  info?(obj: object, message?: string): void;
  debug?(message: string): void;
  debug?(obj: object, message?: string): void;
  warn?(message: string): void;
  warn?(obj: object, message?: string): void;
  error?(message: string): void;
  error?(obj: object, message?: string): void;
  trace?(message: string): void;
  trace?(obj: object, message?: string): void;
  child?(bindings: object): Logger; // 创建带上下文的子 logger
}

示例:

// 开发环境:使用 console
run({ createAgent, logger: console, port: 9000 });

// 生产环境:使用 pino
import pino from "pino";
run({ createAgent, logger: pino({ level: "info" }), port: 9000 });

文档

📚 完整文档请参阅 云开发 Agent 开发指南

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