Simon Willison 1/26/2026

the browser is the sandbox

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The article analyzes the concept of using the modern web browser as a secure sandbox for AI-powered coding agents. It discusses a demo project called Co-do, which leverages browser technologies like the File System Access API, sandboxed iframes, and WebAssembly to provide a safe environment for agents to interact with local files and LLMs, similar to desktop tools but without heavy local containers.

the browser is the sandbox

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