Daytona

Use Daytona sandbox backends with deepagents for isolated code execution with fast cold starts

Daytona provides fast-starting sandbox environments with multi-language support. Best for TypeScript and Python development.

设置

npm

npm install @langchain/daytona

Authentication

Get your API key from app.daytona.io.

export DAYTONA_API_KEY=your_api_key

Or pass credentials directly:

const sandbox = await DaytonaSandbox.create({
  auth: { apiKey: "your-api-key-here" },
});

Usage with deepagents

import { createDeepAgent } from "deepagents";
import { ChatAnthropic } from "@langchain/anthropic";
import { DaytonaSandbox } from "@langchain/daytona";

const sandbox = await DaytonaSandbox.create({
  language: "typescript",
  timeout: 300,
});

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: "Create a hello world TypeScript app and run it" }],
  });
} finally {
  await sandbox.close();
}

Standalone usage

import { DaytonaSandbox } from "@langchain/daytona";

const sandbox = await DaytonaSandbox.create({
  language: "typescript",
  timeout: 300,
});

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

await sandbox.close();

配置

Option	Type	Default	Description
language	string	"typescript"	Primary language runtime. Options: "typescript" | "python" | "javascript"
timeout	number	300	Command timeout in seconds
target	string	"us"	Region. Options: "us" | "eu"
image	string	-	Custom Docker image (e.g., "node:20", "python:3.12")
snapshot	string	-	Snapshot name (cannot be used with image)
resources	object	-	CPU, memory, disk allocation (requires image)
autoStopInterval	number	15	Auto-stop after N minutes idle (0 to disable)
labels	Record<string, string>	-	Custom labels for organizing sandboxes
initialFiles	Record<string, string>	-	Files to create on startup

Custom resources

To customize CPU, memory, or disk, you must specify a Docker image:

const sandbox = await DaytonaSandbox.create({
  image: "node:20",
  language: "typescript",
  resources: {
    cpu: 4,       // Number of CPUs
    memory: 8,    // GiB
    disk: 50,     // GiB
  },
});

Available regions

Region	Location
us	United States
eu	Europe

Accessing the Daytona SDK

For advanced features, access the underlying Daytona SDK:

const daytonaSandbox = await DaytonaSandbox.create();
const sdk = daytonaSandbox.sandbox;

// Use any Daytona SDK feature directly
const workDir = await sdk.getWorkDir();
const homeDir = await sdk.getUserHomeDir();
await sdk.fs.createFolder("src", "755");

Reconnecting to existing sandboxes

// Create sandbox with auto-stop interval
const sandbox = await DaytonaSandbox.create({
  language: "typescript",
  autoStopInterval: 60,
});
const sandboxId = sandbox.id;

// Stop the sandbox (keeps it available)
await sandbox.stop();

// Later: reconnect
const reconnected = await DaytonaSandbox.connect(sandboxId);
await reconnected.start();
const result = await reconnected.execute("ls -la");

Sandbox lifecycle

const sandbox = await DaytonaSandbox.create();

await sandbox.stop();   // Stop (can be restarted)
await sandbox.start();  // Start a stopped sandbox
await sandbox.close();  // Delete permanently

Factory functions

import { createDaytonaSandboxFactory, createDaytonaSandboxFactoryFromSandbox } from "@langchain/daytona";

// Create new sandbox per invocation
const factory = createDaytonaSandboxFactory({ language: "typescript" });

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

Error handling

import { DaytonaSandboxError } from "@langchain/daytona";

try {
  await sandbox.execute("some command");
} catch (error) {
  if (error instanceof DaytonaSandboxError) {
    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 Daytona API key");
        break;
    }
  }
}

Error codes

Code	Description
NOT_INITIALIZED	Sandbox not initialized - call initialize()
ALREADY_INITIALIZED	Cannot initialize twice
AUTHENTICATION_FAILED	Invalid or missing Daytona API key
SANDBOX_CREATION_FAILED	Failed to create sandbox
SANDBOX_NOT_FOUND	Sandbox ID not found or deleted
SANDBOX_NOT_STARTED	Sandbox is not in started state
COMMAND_TIMEOUT	Command execution timed out
COMMAND_FAILED	Command execution failed
FILE_OPERATION_FAILED	File read/write failed
RESOURCE_LIMIT_EXCEEDED	CPU, memory, or storage limits exceeded

Environment variables

Variable	Description
DAYTONA_API_KEY	Daytona API key (required)
DAYTONA_API_URL	Custom Daytona API URL
DAYTONA_TARGET	Default target region (us/eu)

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