"Anthropic released sandboxing capabilities for Claude Code and launched a web-based version of the tool that runs in isolated cloud environments. The company introduced these features to address security risks that arise when Claude Code writes, tests, and debugs code with broad access to developer codebases and files. According to Anthropic, "Giving Claude this much access to your codebase and files can introduce risks, especially in the case of prompt injection.""
"Anthropic built the sandboxing approach on operating system-level features that establish two security boundaries. The first boundary provides filesystem isolation, which the company states "ensures that Claude can only access or modify specific directories." Anthropic positions this as protection against prompt-injected versions of Claude modifying sensitive system files. The second boundary implements network isolation, which the company says "ensures that Claude can only connect to approved servers." This aims to prevent a compromised Claude instance from leaking sensitive information or downloading malware."
Anthropic added sandboxing capabilities and a web-based version of Claude Code that run in isolated cloud environments to mitigate security risks when the model writes, tests, and debugs code with broad repository access. The sandboxing uses operating system-level features to create filesystem isolation that limits Claude to specified directories and network isolation that restricts connections to approved servers. Both boundaries must operate together to prevent exfiltration or sandbox escape. The web version routes git operations through a custom proxy; inside the sandbox the git client authenticates using a custom scoped credential that the proxy verifies.
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