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Modal 提供支持 GPU 的无服务器容器基础设施。最适合 ML/AI 工作负载和 Python 开发。

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设置

npm install @langchain/modal

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认证

从 modal.com/settings/tokens 获取您的令牌。 
export MODAL_TOKEN_ID=your_token_id
export MODAL_TOKEN_SECRET=your_token_secret
或者直接传递凭据： 
const sandbox = await ModalSandbox.create({
  auth: {
    tokenId: "your-token-id",
    tokenSecret: "your-token-secret",
  },
});

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与 deepagents 一起使用

import { createDeepAgent } from "deepagents";
import { ChatAnthropic } from "@langchain/anthropic";
import { ModalSandbox } from "@langchain/modal";

const sandbox = await ModalSandbox.create({
  imageName: "python:3.12-slim",
  timeoutMs: 600_000, // 10 minutes
});

try {
  const agent = createDeepAgent({
    model: new ChatAnthropic({ model: "claude-sonnet-4-20250514" }),
    systemPrompt: "You are a coding assistant with sandbox access.",
    backend: sandbox,
  });

  const result = await agent.invoke({
    messages: [{ role: "user", content: "Install numpy and calculate pi" }],
  });
} finally {
  await sandbox.close();
}

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独立使用

import { ModalSandbox } from "@langchain/modal";

const sandbox = await ModalSandbox.create({
  imageName: "python:3.12-slim",
  timeoutMs: 600_000,
});

const result = await sandbox.execute("python --version");
console.log(result.output);

await sandbox.close();

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配置

选项类型默认值描述
imageNamestring"alpine:3.21"要使用的 Docker 镜像
timeoutMsnumber300000最大生命周期（毫秒）
workdirstring-工作目录
gpustring-GPU 类型 ("T4", "A100", "H100", 等)
cpunumber-CPU 核心数（允许分数）
memoryMiBnumber-内存分配 (MiB)
volumesRecord<string, string>-卷名映射（挂载路径到卷名）
secretsstring[]-要注入的 Modal Secret 名称
initialFilesRecord<string, string | Uint8Array>-启动时要创建的文件
envRecord<string, string>-环境变量
blockNetworkboolean-阻止网络访问
namestring-沙盒名称（应用程序内唯一）

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GPU 支持

Modal 支持 NVIDIA GPU 用于 ML 工作负载： 
const sandbox = await ModalSandbox.create({
  imageName: "python:3.12-slim",
  gpu: "T4",  // or "L4", "A10G", "A100", "H100"
});

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卷和密钥

挂载 Modal 卷以进行持久存储，并将密钥作为环境变量注入： 
// Volumes and secrets must be created in Modal first
const sandbox = await ModalSandbox.create({
  imageName: "python:3.12-slim",
  volumes: {
    "/data": "my-data-volume",
    "/models": "my-models-volume",
  },
  secrets: ["my-api-keys", "database-credentials"],
});

// Files in /data and /models persist across sandbox restarts
await sandbox.execute("echo 'Hello' > /data/test.txt");

// Secrets are available as environment variables
await sandbox.execute("echo $API_KEY");

​
初始文件

在创建期间使用文件预填充沙盒： 
const sandbox = await ModalSandbox.create({
  imageName: "python:3.12-slim",
  initialFiles: {
    "/app/main.py": 'print("Hello from Python!")',
    "/app/config.json": JSON.stringify({ name: "my-app" }, null, 2),
  },
});

const result = await sandbox.execute("python /app/main.py");

​
访问 Modal SDK

对于 BaseSandbox 未公开的高级功能，请访问底层 Modal SDK： 
const modalSandbox = await ModalSandbox.create();

const client = modalSandbox.client;     // ModalClient
const instance = modalSandbox.instance;  // Sandbox

// Direct SDK operations
const process = await instance.exec(["python", "-c", "print('Hello')"], {
  stdout: "pipe",
  stderr: "pipe",
});

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重新连接到现有沙盒

// Reconnect by ID
const reconnected = await ModalSandbox.fromId(sandboxId);

// Reconnect by name
const reconnected2 = await ModalSandbox.fromName("my-app", "my-sandbox");

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工厂函数

import { createModalSandboxFactory, createModalSandboxFactoryFromSandbox } from "@langchain/modal";

// Create new sandbox per invocation
const factory = createModalSandboxFactory({ imageName: "python:3.12-slim" });

// Or reuse an existing sandbox across invocations
const sandbox = await ModalSandbox.create();
const reuseFactory = createModalSandboxFactoryFromSandbox(sandbox);

​
错误处理

import { ModalSandboxError } from "@langchain/modal";

try {
  await sandbox.execute("some command");
} catch (error) {
  if (error instanceof ModalSandboxError) {
    switch (error.code) {
      case "NOT_INITIALIZED":
        await sandbox.initialize();
        break;
      case "COMMAND_TIMEOUT":
        console.error("Command took too long");
        break;
      case "AUTHENTICATION_FAILED":
        console.error("Check your Modal token credentials");
        break;
    }
  }
}

​
错误代码

代码描述
NOT_INITIALIZED沙盒未初始化 - 调用 initialize()
ALREADY_INITIALIZED无法初始化两次
AUTHENTICATION_FAILED无效或缺少 Modal 令牌
SANDBOX_CREATION_FAILED创建沙盒失败
SANDBOX_NOT_FOUND沙盒 ID/名称未找到或已过期
COMMAND_TIMEOUT命令执行超时
COMMAND_FAILED命令执行失败
FILE_OPERATION_FAILED文件读/写失败
RESOURCE_LIMIT_EXCEEDEDCPU、内存或存储限制超出
VOLUME_ERROR卷操作失败

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环境变量

变量描述
MODAL_TOKEN_IDModal API 令牌 ID
MODAL_TOKEN_SECRETModal API 令牌密钥
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