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Some sources use automated detection systems that can block agent sessions. Stealth mode ensures your task runs complete without interruption, even on protected sources. Basic stealth mode is active by default, and Advanced stealth mode is available on Enterprise plans.

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Basic stealth mode

Basic stealth mode is active on all connections across all plans. Deck adapts the execution environment to handle common protections that sources use to gate access. No configuration or code changes are required in your integration.

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Advanced stealth mode

Available on Enterprise plans.
For heavily protected sources where basic stealth mode isn’t enough, Advanced stealth mode applies more sophisticated techniques. Deck handles these automatically with no additional configuration on your end.

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What Deck handles

Stealth mode covers a range of protections that sources use to gate access:
ProtectionHow Deck responds
Bot detectionDeck adapts its execution environment so sessions are indistinguishable from real user activity.
CAPTCHAsDetected and resolved automatically. Solving typically completes within seconds.
Device trust and fingerprintingEach session presents unique, realistic device signals that match what the source expects.
Rate limiting and behavioral analysisDeck paces interactions to match natural usage patterns for the source.
These protections vary across sources and can change over time. Deck continuously updates its approach so your integration stays stable.

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Identifying blocked connections

If a source blocks a connection due to anti-bot protections, Deck returns a blocked error with HTTP status 503: 
{
  "errors": [
    {
      "type": "connection",
      "code": "blocked",
      "message": "Blocked by antibot."
    }
  ]
}
If you see this error consistently, upgrading to Advanced stealth mode will typically resolve it. Contact your account team to enable Enterprise features. If you see this error on an Enterprise account with Advanced stealth mode active, file a support ticket at help@deck.co. The team can investigate source-specific protections and push updates to your account.