Steel

Run agent browser sessions on Steel.

Import from libretto-browser-tools/steel. For Libretto CLI open / run on Steel, see Alternative providers: Steel.

Configure

1234STEEL_API_KEY=<steel-api-key>
# optional
# STEEL_BASE_URL=https://api.steel.dev
# STEEL_CONNECT_URL=wss://connect.steel.dev

Provider options

Constructor / env settings for the provider itself:

Option	Env	Default	Description
`apiKey`	`STEEL_API_KEY`	(required)	API key
`endpoint`	`STEEL_BASE_URL`	`https://api.steel.dev`	REST API base URL
`connectEndpoint`	`STEEL_CONNECT_URL`	`wss://connect.steel.dev`	CDP connect websocket base
`useProxy`	—	—	Enable Steel proxy when `true`
`solveCaptcha`	—	—	Enable captcha solving when `true`
`timeoutMs`	—	—	Session timeout in milliseconds
`inactivityTimeoutMs`	—	—	Inactivity timeout in milliseconds

Session create options

Pass these to provider.createSession({ ... }) (or via browser_open({ url }) for startUrl):

Option	Description
`viewport`	`{ width, height }` via Steel `dimensions`
`startUrl`	Accepted for API symmetry; Steel cannot preload it — `browser_open` navigates after connect

Created sessions may include liveViewUrl (Steel session viewer).

Example

123456789101112import { createAiSdkBrowserTools } from "libretto-browser-tools/ai-sdk";
import { SteelBrowserProvider } from "libretto-browser-tools/steel";

const { tools, dispose } = createAiSdkBrowserTools(
  new SteelBrowserProvider({ useProxy: true }),
);

try {
  // agent loop using tools…
} finally {
  await dispose();
}