在 Agent Runtime 上开发和部署代理

借助 Agent Runtime,您可以托管使用各种框架开发的代理。本文档介绍了如何使用 LangGraph、LangChain、AG2 或 LlamaIndex 创建、部署和测试代理。

本快速入门将引导您完成以下步骤:

  • 设置 Google Cloud 项目。
  • 安装 Agent Platform SDK for Python 和您选择的框架。
  • 开发货币兑换代理。
  • 将代理部署到 Agent Runtime。
  • 测试已部署的代理。

如需了解使用智能体开发套件 (ADK) 的快速入门,请参阅使用智能体开发套件在 Agent Platform 上开发和部署代理

准备工作

  1. 登录您的 Google Cloud 账号。如果您是 Google Cloud的新用户, 请创建一个账号,以便在 真实场景中评估我们产品的性能。新客户还可获享 $300 赠金,用于 运行、测试和部署工作负载。
  2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator role (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  3. Verify that billing is enabled for your Google Cloud project.

  4. Enable the Agent Platform and Cloud Storage APIs.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the APIs

  5. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

    Roles required to select or create a project

    • Select a project: Selecting a project doesn't require a specific IAM role—you can select any project that you've been granted a role on.
    • Create a project: To create a project, you need the Project Creator role (roles/resourcemanager.projectCreator), which contains the resourcemanager.projects.create permission. Learn how to grant roles.

    Go to project selector

  6. Verify that billing is enabled for your Google Cloud project.

  7. Enable the Agent Platform and Cloud Storage APIs.

    Roles required to enable APIs

    To enable APIs, you need the Service Usage Admin IAM role (roles/serviceusage.serviceUsageAdmin), which contains the serviceusage.services.enable permission. Learn how to grant roles.

    Enable the APIs

如需获取使用 Agent Runtime 所需的权限,请让您的管理员为您授予项目的以下 IAM 角色:

如需详细了解如何授予角色,请参阅管理对项目、文件夹和组织的访问权限

您也可以通过自定义 角色或其他预定义 角色来获取所需的权限。

安装并初始化 Agent Platform SDK for Python

  1. 运行以下命令以安装 Agent Platform SDK for Python 和其他 所需的软件包:

    LangGraph

    pip install --upgrade --quiet google-cloud-aiplatform[agent_engines,langchain]>=1.112

    LangChain

    pip install --upgrade --quiet google-cloud-aiplatform[agent_engines,langchain]>=1.112

    AG2

    pip install --upgrade --quiet google-cloud-aiplatform[agent_engines,ag2]>=1.112

    LlamaIndex

    pip install --upgrade --quiet google-cloud-aiplatform[agent_engines,llama_index]>=1.112
  2. 以用户身份进行身份验证

    Colab

    运行以下代码:

    from google.colab import auth
    
    auth.authenticate_user(project_id="PROJECT_ID")
    

    Cloud Shell

    您无需执行任何操作。

    本地 Shell

    运行以下命令:

    gcloud auth application-default login
  3. 运行以下代码以导入 Agent Platform 并初始化 SDK:

    1. (可选)在测试您开发的代理之前,您需要导入 Agent Platform 并初始化 SDK,如下所示:

      Google Cloud 项目

      import vertexai
      
      vertexai.init(
          project="PROJECT_ID",               # Your project ID.
          location="LOCATION",                # Your cloud region.
      )
      

      其中:

    2. 部署代理之前,您需要导入 Agent Platform 并初始化 SDK,如下所示:

      Google Cloud 项目

      import vertexai
      
      client = vertexai.Client(
          project="PROJECT_ID",               # Your project ID.
          location="LOCATION",                # Your cloud region.
      )
      

      其中:

开发代理

  1. 为代理开发货币兑换工具:

    def get_exchange_rate(
        currency_from: str = "USD",
        currency_to: str = "EUR",
        currency_date: str = "latest",
    ):
        """Retrieves the exchange rate between two currencies on a specified date."""
        import requests
    
        response = requests.get(
            f"https://api.frankfurter.app/{currency_date}",
            params={"from": currency_from, "to": currency_to},
        )
        return response.json()
    
  2. 实例化代理:

    LangGraph

    from vertexai import agent_engines
    
    agent = agent_engines.LanggraphAgent(
        model="gemini-2.0-flash",
        tools=[get_exchange_rate],
        model_kwargs={
            "temperature": 0.28,
            "max_output_tokens": 1000,
            "top_p": 0.95,
        },
    )
    

    LangChain

    from vertexai import agent_engines
    
    agent = agent_engines.LangchainAgent(
        model="gemini-2.0-flash",
        tools=[get_exchange_rate],
        model_kwargs={
            "temperature": 0.28,
            "max_output_tokens": 1000,
            "top_p": 0.95,
        },
    )
    

    AG2

    from vertexai import agent_engines
    
    agent = agent_engines.AG2Agent(
        model="gemini-2.0-flash",
        runnable_name="Get Exchange Rate Agent",
        tools=[get_exchange_rate],
    )
    

    LlamaIndex

    from vertexai.preview import reasoning_engines
    
    def runnable_with_tools_builder(model, runnable_kwargs=None, **kwargs):
        from llama_index.core.query_pipeline import QueryPipeline
        from llama_index.core.tools import FunctionTool
        from llama_index.core.agent import ReActAgent
    
        llama_index_tools = []
        for tool in runnable_kwargs.get("tools"):
            llama_index_tools.append(FunctionTool.from_defaults(tool))
        agent = ReActAgent.from_tools(llama_index_tools, llm=model, verbose=True)
        return QueryPipeline(modules = {"agent": agent})
    
    agent = reasoning_engines.LlamaIndexQueryPipelineAgent(
        model="gemini-2.0-flash",
        runnable_kwargs={"tools": [get_exchange_rate]},
        runnable_builder=runnable_with_tools_builder,
    )
    
  3. 在本地测试代理:

    LangGraph

    agent.query(input={"messages": [
        ("user", "What is the exchange rate from US dollars to SEK today?"),
    ]})
    

    LangChain

    agent.query(
        input="What is the exchange rate from US dollars to SEK today?"
    )
    

    AG2

    agent.query(
        input="What is the exchange rate from US dollars to SEK today?"
    )
    

    LlamaIndex

    agent.query(
        input="What is the exchange rate from US dollars to SEK today?"
    )
    

部署代理

通过在 Agent Platform 中创建 reasoningEngine 资源来部署代理:

LangGraph

remote_agent = client.agent_engines.create(
    agent,
    config={
        "requirements": ["google-cloud-aiplatform[agent_engines,langchain]"],
        "identity_type": types.IdentityType.AGENT_IDENTITY,
    },
)

LangChain

remote_agent = client.agent_engines.create(
    agent,
    config={
        "requirements": ["google-cloud-aiplatform[agent_engines,langchain]"],
        "identity_type": types.IdentityType.AGENT_IDENTITY,
    },
)

AG2

remote_agent = client.agent_engines.create(
    agent,
    config={
        "requirements": ["google-cloud-aiplatform[agent_engines,ag2]"],
        "identity_type": types.IdentityType.AGENT_IDENTITY,
    },
)

LlamaIndex

remote_agent = client.agent_engines.create(
    agent,
    config={
        "requirements": ["google-cloud-aiplatform[agent_engines,llama_index]"],
        "identity_type": types.IdentityType.AGENT_IDENTITY,
    },
)

使用代理

通过发送查询来测试部署的代理:

LangGraph

remote_agent.query(input={"messages": [
    ("user", "What is the exchange rate from US dollars to SEK today?"),
]})

LangChain

remote_agent.query(
    input="What is the exchange rate from US dollars to SEK today?"
)

AG2

remote_agent.query(
    input="What is the exchange rate from US dollars to SEK today?"
)

LlamaIndex

remote_agent.query(
    input="What is the exchange rate from US dollars to SEK today?"
)

清理

为避免因本页中使用的资源导致您的 Google Cloud 账号产生费用,请按照以下步骤操作。

remote_agent.delete(force=True)

后续步骤

指南

设置环境以使用 Agent Platform Runtime。

指南

了解根据您的开发需求在 Agent Platform Runtime 上部署代理的五种方法。

指南

了解如何管理已部署到 Agent Platform 托管式运行时的代理。

指南

使用 Agent Platform Runtime 中的代理。

资源

查找 Google Agent Platform 的相关资源和支持。