# Introduction

secure-exec/examples/quickstart/src/index.ts:

```ts
import { evaluate } from "secure-exec";

// Each call runs in a fresh VM that is disposed when the call finishes.
const sum = await evaluate<number>("1 + 2");
console.log(sum.outcome === "succeeded" ? sum.value : sum.error); // 3
```

- **One function call.** `evaluate` and `execute` are all you need. There is no
  runtime object to create, configure, and dispose.
- **Real Node.js inside.** Guest code runs on V8 with `node:fs`,
  `node:child_process`, sockets, and npm packages. It is not a stripped-down
  interpreter.
- **Deny by default.** The guest sees a virtual filesystem and no network until
  you [allow it](/secure-exec/docs/permissions).
- **No infrastructure.** `npm install secure-exec`. No containers, no vendor
  account, no API keys.

## Where to start

- [Quickstart](/secure-exec/docs/quickstart) installs the package and runs your first snippet.
- [Agent Code Tool](/secure-exec/docs/use-cases/agent-code-tool) wires it into an agent tool.
- [Security](/secure-exec/docs/security) covers what is isolated and what is denied by default.