Claude Cowork now runs in Chrome extension with skills and plugins

Anthropic's Chrome extension has long offered the ability to browse, click, type, and fill out forms on any webpage you're logged into—essentially automating low-level web interactions. Until now, that capability was limited to information gathering. The integration of Claude Cowork into the extension's side panel extends the extension's utility by allowing users to not only research but also synthesize that research into structured business outputs in a single workflow. This removes friction: users no longer need to switch contexts between a web browser and a separate Cowork interface to move from data collection to document creation.

The security posture reflects a broader tension in LLM-powered browser tools. Because the extension reads and interacts with the page you're viewing, it is theoretically exposed to malicious page content that could inject hidden instructions into Claude's reasoning (a "prompt injection" attack). Anthropic's explicit warning against use with banking or health data indicates the company is prioritizing user choice over locking down the feature, trusting users to assess their own risk tolerance based on the data they handle.