Simon Willison 5/30/2026

How we contain Claude across products

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This article provides a detailed overview of how Anthropic implements sandboxing techniques across its Claude product line, including Claude.ai, Claude Code, and Cowork. It covers the use of process sandboxes, VMs, filesystem boundaries, and egress controls to constrain agent actions and prevent credential exfiltration. Specific technologies like gVisor, Seatbelt, Bubblewrap, and Apple's Virtualization framework are discussed, along with past security risks and the open-source srt tool.

How we contain Claude across products

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