sandbox-bwrap-nix is a minimal sandbox that combines bubblewrap and Nix to provide an isolated environment for running commands, AI agents, and experiments on Linux. It addresses the concern of AI coding tools potentially deleting or altering files in the host's home directory, configuration files, or projects by creating a clean, isolated shell that boots in under a second.
The tool requires no daemon, no image pulls, and no root privileges. It works on any Linux machine with bubblewrap installed and Nix with flakes enabled. The project consists of a few files, with the main entry point being a shell script that invokes bwrap using a specific set of flags. It mounts the host's Nix store as read-only to allow use of any Nix package while providing the sandbox with its own temporary directory, home directory, and process namespace. The host filesystem remains invisible from within the sandbox. The script then executes nix develop inside the sandbox.
It is intended for users who run AI coding tools or experiments and seek a lightweight alternative to heavier container solutions such as Docker or Podman.
sandbox-bwrap-nix is a Developer Tools project. Risk of AI coding agents or experiments damaging host filesystems or configurations when running untrusted code. It is built as an open-source project for developers and AI researchers. sandbox-bwrap-nix is open source under the Open Source license. sandbox-bwrap-nix is available on the web and the command line, and it can be self-hosted.
Behind sandbox-bwrap-nix is Luigi, and it first shipped in 2025. Among its 5 catalogued features are Isolated Environment, Bubblewrap Integration, and Nix Flakes Support.
Summary written by a language model from the project’s public pages.
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