---
title: "E2B"
description: "Deploy the daemon inside an E2B sandbox."
---

## Prerequisites

- `E2B_API_KEY` environment variable
- `ANTHROPIC_API_KEY` or `OPENAI_API_KEY` for the coding agents

## TypeScript Example

```typescript
import { Sandbox } from "@e2b/code-interpreter";
import { SandboxAgent } from "sandbox-agent";

// Pass API keys to the sandbox
const envs: Record<string, string> = {};
if (process.env.ANTHROPIC_API_KEY) envs.ANTHROPIC_API_KEY = process.env.ANTHROPIC_API_KEY;
if (process.env.OPENAI_API_KEY) envs.OPENAI_API_KEY = process.env.OPENAI_API_KEY;

const sandbox = await Sandbox.create({ envs });

// Install sandbox-agent
await sandbox.commands.run(
  "curl -fsSL https://releases.rivet.dev/sandbox-agent/latest/install.sh | sh"
);

// Start the server in the background
await sandbox.commands.run(
  "sandbox-agent server --no-token --host 0.0.0.0 --port 3000",
  { background: true }
);

// Connect to the server
const baseUrl = `https://${sandbox.getHost(3000)}`;
const client = await SandboxAgent.connect({ baseUrl });

// Wait for server to be ready
for (let i = 0; i < 30; i++) {
  try {
    await client.getHealth();
    break;
  } catch {
    await new Promise((r) => setTimeout(r, 1000));
  }
}

// Install agents (or pre-install in a custom template)
await client.installAgent("claude");
await client.installAgent("codex");

// Create a session and start coding
await client.createSession("my-session", {
  agent: "claude",
  permissionMode: "default",
});

await client.postMessage("my-session", {
  message: "Summarize this repository",
});

for await (const event of client.streamEvents("my-session")) {
  console.log(event.type, event.data);
}

// Cleanup
await sandbox.kill();
```

## Faster Cold Starts

For faster startup, create a custom E2B template with sandbox-agent and agents pre-installed:

1. Create a template with the install script baked in
2. Pre-install agents: `sandbox-agent install-agent claude codex`
3. Use the template ID when creating sandboxes

See [E2B Custom Templates](https://e2b.dev/docs/sandbox-template) for details.
