Claude Cowork Launches in the Chrome Side Panel

ArticleAnthropicAnnouncement

Anthropic has turned the Claude in Chrome side panel into a Claude Cowork session, enabling cross-tab web automation that syncs seamlessly with desktop, mobile, and web apps.

Key points

  1. The Chrome side panel now runs Claude Cowork sessions with full history, skills, and connector support.
  2. Claude can view pages, click links, fill forms, and navigate tabs using existing user logins for systems lacking direct API connections.
  3. Work sessions live with the user account, allowing tasks started in a browser tab to be resumed in the desktop, web, or mobile app.
  4. To mitigate prompt injection, an automated verification step checks consequential actions (submissions, downloads) against the original prompt before execution.
  5. Available immediately on Max and Team plans, rolling out to Pro soon; Enterprise accounts have it turned off by default with admin domain controls.

Why it matters

Autonomous browser agents bridge the gap for legacy tools and vendor portals without APIs. Tying the browser extension directly to Cowork makes multi-step workflows cross-device, while automated safeguards attempt to tackle the persistent challenge of prompt injection in untrusted web pages.

Analysis

Unifying the browser extension with Cowork solves the context fragmentation that previously separated browser-specific tasks from broader desktop workflows. Users can automate tedious browser interactions—such as pulling invoices across diverse portals—and instantly switch to the desktop client to combine the results with local files. As browser-based agents interact with arbitrary web content, they face severe prompt injection risks; Anthropic’s policy of verifying actions against the user's initial prompt before executing irreversible steps represents an essential defense layer for automated browsing.

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Summary generated by AI (Gemini 3.8 Flash, 27 September 2026). It may contain errors – the original source is authoritative.

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