# Use the E2B SDK

> Move an E2B integration to Shardflux by changing three environment variables.

## Move your existing integration

The fastest way to move an E2B integration to Shardflux is to keep your E2B SDK and change its connection settings.
Your harness keeps its sandbox, command and file calls. Create a project API key in the console, then set:

```sh
export E2B_API_URL=https://e2b.shardflux.dev
export E2B_DOMAIN=e2b.shardflux.dev
export E2B_API_KEY="$SHARDFLUX_API_KEY"
```

The `base` template selects Shardflux's default Python, Node and browser environment. A sandbox id is also its
Shardflux workspace id, so you can inspect it in the console or open it with the native SDK.

## JavaScript

```ts
import { Sandbox } from 'e2b';

const sandbox = await Sandbox.create({ timeoutMs: 300_000 });
try {
  await sandbox.files.write('/home/user/input.txt', 'hello');
  const result = await sandbox.commands.run('cat /home/user/input.txt');
  console.log(result.stdout);
} finally {
  await sandbox.kill();
}
```

## Python

```python
from e2b import Sandbox

sandbox = Sandbox.create(timeout=300)
try:
    sandbox.files.write('/home/user/input.txt', 'hello')
    result = sandbox.commands.run('cat /home/user/input.txt')
    print(result.stdout)
finally:
    sandbox.kill()
```

## Keep a sandbox between tasks

Call `pause()` to suspend a sandbox with its memory, processes and disk. `Sandbox.connect(id)` resumes the same
sandbox. To pause when its timeout expires, create it with `lifecycle: { onTimeout: 'pause', autoResume: false }`
in JavaScript, or `lifecycle={'on_timeout': 'pause', 'auto_resume': False}` in Python. `setTimeout` / `set_timeout`
renews its deadline from now. `kill()` deletes it when you have finished.

The [E2B SDK reference](https://docs.shardflux.dev/reference/e2b.md) lists method mappings and protocol facts. For new integrations,
[workspace tools](https://docs.shardflux.dev/guides/agent-tools.md) and the [agent loop](https://docs.shardflux.dev/concepts/lifecycle.md) expose Shardflux's turn controls directly.