sandbox-agent/docs/sdk-overview.mdx

---
title: "SDK Overview"
description: "Use the TypeScript SDK to manage Sandbox Agent sessions and APIs."
icon: "compass"
---

The TypeScript SDK is centered on `sandbox-agent` and its `SandboxAgent` class.

## Install

<Tabs>
  <Tab title="npm">
    ```bash
    npm install sandbox-agent@0.4.x
    ```
  </Tab>
  <Tab title="bun">
    ```bash
    bun add sandbox-agent@0.4.x
    # Allow Bun to run postinstall scripts for native binaries (required for SandboxAgent.start()).
    bun pm trust @sandbox-agent/cli-linux-x64 @sandbox-agent/cli-linux-arm64 @sandbox-agent/cli-darwin-arm64 @sandbox-agent/cli-darwin-x64 @sandbox-agent/cli-win32-x64
    ```
  </Tab>
</Tabs>

## Optional React components

```bash
npm install @sandbox-agent/react@0.4.x
```

## Create a client

```ts
import { SandboxAgent } from "sandbox-agent";

const sdk = await SandboxAgent.connect({
  baseUrl: "http://127.0.0.1:2468",
});
```

`SandboxAgent.connect(...)` now waits for `/v1/health` by default before other SDK requests proceed. To disable that gate, pass `waitForHealth: false`. To keep the default gate but fail after a bounded wait, pass `waitForHealth: { timeoutMs: 120_000 }`. To cancel the startup wait early, pass `signal: abortController.signal`.

With a custom fetch handler (for example, proxying requests inside Workers):

```ts
const sdk = await SandboxAgent.connect({
  fetch: (input, init) => customFetch(input, init),
});
```

With an abort signal for the startup health gate:

```ts
const controller = new AbortController();

const sdk = await SandboxAgent.connect({
  baseUrl: "http://127.0.0.1:2468",
  signal: controller.signal,
});

controller.abort();
```

With persistence (see [Persisting Sessions](/session-persistence) for driver options):

```ts
import { SandboxAgent, InMemorySessionPersistDriver } from "sandbox-agent";

const persist = new InMemorySessionPersistDriver();

const sdk = await SandboxAgent.connect({
  baseUrl: "http://127.0.0.1:2468",
  persist,
});
```

Local spawn with a sandbox provider:

```ts
import { SandboxAgent } from "sandbox-agent";
import { local } from "sandbox-agent/local";

const sdk = await SandboxAgent.start({
  sandbox: local(),
});

// sdk.sandboxId — prefixed provider ID (e.g. "local/127.0.0.1:2468")

await sdk.destroySandbox(); // provider-defined cleanup + disposes client
```

`SandboxAgent.start(...)` requires a `sandbox` provider. Built-in providers:

| Import | Provider |
|--------|----------|
| `sandbox-agent/local` | Local subprocess |
| `sandbox-agent/docker` | Docker container |
| `sandbox-agent/e2b` | E2B sandbox |
| `sandbox-agent/daytona` | Daytona workspace |
| `sandbox-agent/vercel` | Vercel Sandbox |
| `sandbox-agent/cloudflare` | Cloudflare Sandbox |
| `sandbox-agent/agentcomputer` | Agent Computer managed worker |

Use `sdk.dispose()` to disconnect without changing sandbox state, `sdk.pauseSandbox()` for graceful suspension when supported, or `sdk.killSandbox()` for permanent deletion.

## Session flow

```ts
const session = await sdk.createSession({
  agent: "mock",
  cwd: "/",
});

const prompt = await session.prompt([
  { type: "text", text: "Summarize this repository." },
]);

console.log(prompt.stopReason);
```

Load and destroy:

```ts
const restored = await sdk.resumeSession(session.id);
await restored.prompt([{ type: "text", text: "Continue from previous context." }]);

await sdk.destroySession(restored.id);
```

## Session configuration

Set model, mode, or thought level at creation or on an existing session:

```ts
const session = await sdk.createSession({
  agent: "codex",
  model: "gpt-5.3-codex",
});

await session.setModel("gpt-5.2-codex");
await session.setMode("auto");

const options = await session.getConfigOptions();
const modes = await session.getModes();
```

Handle permission requests from agents that ask before executing tools:

```ts
const claude = await sdk.createSession({
  agent: "claude",
  mode: "default",
});

claude.onPermissionRequest((request) => {
  void claude.respondPermission(request.id, "once");
});
```

See [Agent Sessions](/agent-sessions) for full details on config options and error handling.

## Events

Subscribe to live events:

```ts
const unsubscribe = session.onEvent((event) => {
  console.log(event.eventIndex, event.sender, event.payload);
});

await session.prompt([{ type: "text", text: "Give me a short summary." }]);
unsubscribe();
```

Fetch persisted events:

```ts
const page = await sdk.getEvents({
  sessionId: session.id,
  limit: 100,
});

console.log(page.items.length);
```

## Control-plane and HTTP helpers

```ts
const health = await sdk.getHealth();
const agents = await sdk.listAgents();
await sdk.installAgent("codex", { reinstall: true });

const entries = await sdk.listFsEntries({ path: "." });
const writeResult = await sdk.writeFsFile({ path: "./hello.txt" }, "hello");

console.log(health.status, agents.agents.length, entries.length, writeResult.path);
```

## Desktop API

The SDK also wraps the desktop host/runtime HTTP API.

Install desktop dependencies first on Linux hosts:

```bash
sandbox-agent install desktop --yes
```

Then query status, surface remediation if needed, and start the runtime:

```ts
const status = await sdk.getDesktopStatus();

if (status.state === "install_required") {
  console.log(status.installCommand);
}

const started = await sdk.startDesktop({
  width: 1440,
  height: 900,
  dpi: 96,
});

const screenshot = await sdk.takeDesktopScreenshot();
const displayInfo = await sdk.getDesktopDisplayInfo();

await sdk.moveDesktopMouse({ x: 400, y: 300 });
await sdk.clickDesktop({ x: 400, y: 300, button: "left", clickCount: 1 });
await sdk.typeDesktopText({ text: "hello world", delayMs: 10 });
await sdk.pressDesktopKey({ key: "ctrl+l" });

await sdk.stopDesktop();
```

Screenshot helpers return `Uint8Array` PNG bytes. The SDK does not attempt to install OS packages remotely; callers should surface `missingDependencies` and `installCommand` from `getDesktopStatus()`.

## Error handling

```ts
import { SandboxAgentError } from "sandbox-agent";

try {
  await sdk.listAgents();
} catch (error) {
  if (error instanceof SandboxAgentError) {
    console.error(error.status, error.problem);
  }
}
```

## Inspector URL

When you call `SandboxAgent.start(...)`, prefer `sdk.inspectorUrl`. Some hosted providers return a browser-ready Inspector URL there.

```ts
import { buildInspectorUrl } from "sandbox-agent";

const url = buildInspectorUrl({
  baseUrl: "https://your-sandbox-agent.example.com",
  headers: { "X-Custom-Header": "value" },
});

console.log(url);
```

Parameters:

- `baseUrl` (required unless `fetch` is provided): Sandbox Agent server URL
- `token` (optional): Bearer token for authenticated servers
- `headers` (optional): Additional request headers
- `fetch` (optional): Custom fetch implementation used by SDK HTTP and session calls
- `skipHealthCheck` (optional): set `true` to skip the startup `/v1/health` wait
- `waitForHealth` (optional, defaults to enabled): waits for `/v1/health` before HTTP helpers and session setup proceed; pass `false` to disable or `{ timeoutMs }` to bound the wait
- `signal` (optional): aborts the startup `/v1/health` wait used by `connect()`

## LLM credentials

Sandbox Agent supports personal API keys, shared organization keys, and per-tenant gateway keys with budget enforcement. See [LLM Credentials](/llm-credentials) for setup details.