
MarkTechPost: Meet Anthropic’s sandbox-runtime: OS-Level Sandboxing for AI Agents, No Containers
In this article, we will discuss newly trending open sourced Anthropic’s sandbox-runtime (srt), the OS-level sandbox behind Claude Code’s sandboxed bash tool. The Anthropic sandbox-runtime limits which files a process can touch and which hosts it can reach. It does this without spinning up a container. It is also not tied to Claude Code. Your own agents, local MCP servers and plain command-line programs can run inside it. TL;DR Size: npm package @anthropic-ai/sandbox-runtime
Sandbox-runtime is an open-source tool that restricts which files and network hosts a process can access by using each operating system's built-in isolation features rather than containers. It matters because it reduces the number of permission prompts developers must approve when running AI agents, with one internal report showing an 84% reduction in such prompts. The tool works on macOS and Linux by default, with Windows support still in early stages, and can sandbox not just AI agents but any command-line program or script. Security requires both filesystem and network boundaries together, since a compromised agent could otherwise steal data like SSH keys or escape restrictions to access the network.
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