A free, open-source sandbox that runs coding agents in a Linux micro-VM on a project copy, so you review diffs before anything reaches your files.
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1 / 2Overview
What is Mudroom?
Run coding agents in a VM, review changes like a PR
Mudroom is a free, open-source sandbox for developers who run coding agents with permission prompts off and want to see what the agent did before it touches their real project.
Each session clones the project, including untracked and ignored files, and boots a Linux micro-VM with only that clone inside. On a Mac the micro-VM uses Apple's container runtime; on Linux and Windows it uses Docker or Podman. The sandbox has no DNS and no route out by default, and the only exit is a proxy on the user's machine that allows the agent's API hosts plus the hosts added, and logs every connection.
When the agent finishes, Mudroom shows the diff like a pull request. Apply everything, some files or single hunks, and undo any apply later. If a file changed in the project since the session started, Mudroom flags the conflict and will not overwrite it. Mudroom is MIT licensed, with no account and no telemetry.
Platforms and languages
Mudroom Availability
Platforms
Languages
Capabilities
Mudroom Key Features
Linux micro-VM per session
Runs the agent in a Linux micro-VM on a copy-on-write clone of the project, so the real folder is never mounted.
Network allowlist
Blocks DNS and outbound routes by default, with a proxy allowing only the agent's API hosts and added hosts, logging every connection.
PR-style review
Review the diff like a pull request and apply everything, some files or single hunks, with undo for any apply.
Works with many agents
Supports Claude Code, Codex, Gemini CLI, opencode and Aider, or any command, with local models through Ollama or LM Studio.
App and CLI
Offers a native Swift app for macOS and a command-line tool for Linux, Windows and Intel Macs.
Best for
Who uses Mudroom?
Developers running coding agents such as Claude Code and Codex
Run agents safely in a VM and review their changes before applying them
Plans and access
Mudroom Pricing
Free
Free and open source (MIT); no account or subscription
Common questions
Mudroom FAQs
Is Mudroom free?
Yes. Mudroom is free and MIT licensed, with no account, no telemetry and no subscription.
Does Mudroom change my real project files?
No. The agent works on a copy in a micro-VM, and nothing reaches your real folder until you apply the diff.
Which agents does Mudroom support?
Mudroom supports Claude Code, Codex, Gemini CLI, opencode and Aider, or any command, with local models through Ollama or LM Studio.
Which platforms does Mudroom run on?
Mudroom offers a native macOS app on Apple silicon, plus a CLI for Linux, Windows and Intel Macs.
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