Stealth Mode

Stealth mode makes browser runtimes harder to detect as automated. It patches common detection signals and optionally adds human-like mouse movements, click timing, and scrolling.

Enabling stealth

humanize

Enable human-like behavior simulation when launching a runtime:

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const runtime = await workspace.runtimes.browser("main").playwright({
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  mode: "ephemeral",
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  config: {
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    humanize: true,
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  },
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});

When humanize is enabled:

• Mouse movements follow natural Bezier curves instead of teleporting
• Random micro-movements are added between actions
• Click timing varies realistically
• Scrolling mimics human patterns
• Typing has variable keystroke delays

humanizePersonaId

Each persona ID (0–124) represents a distinct behavioral profile — different movement speeds, curve patterns, and interaction styles:

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const runtime = await workspace.runtimes.browser("main").playwright({
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  mode: "ephemeral",
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  config: {
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    humanize: true,
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    humanizePersonaId: 42,
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  },
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});

Use a fixed persona ID when you want repeatable behavior across runs. Omit it for random selection.

What stealth patches

Under the hood, stealth mode patches common automation detection points:

• WebDriver flags — Hides navigator.webdriver and related properties
• Browser fingerprint — Normalizes canvas, WebGL, and audio fingerprints
• Timing patterns — Randomizes execution timing to avoid detection
• Chrome DevTools Protocol — Masks CDP connection signals

Combining with other features

Stealth mode works well with other anti-detection features:

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const runtime = await workspace.runtimes.browser("main").playwright({
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  mode: "profile",
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  profileId: "my-profile",
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  config: {
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    humanize: true,
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    humanizePersonaId: 7,
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    solveCaptchas: true,
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    proxy: {
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      type: "http",
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      host: "residential.proxy.com",
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      port: 9090,
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    },
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  },
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});

This gives you a persistent identity (profile), human-like behavior, automatic captcha solving, and residential proxy — all in one runtime.