Asylum

Docker sandbox for AI coding agents. Single binary, runs on Linux and macOS (ARM and x86).

Asylum wraps Docker to give Claude Code, Gemini CLI, and Codex a full development environment with Python, Node.js, Java, and Docker-in-Docker — while keeping your host clean. Containers are ephemeral, but caches, auth, and history persist.

Install

curl -fsSL https://raw.githubusercontent.com/inventage-ai/asylum/main/install.sh | sh

Or download a binary from the releases page and put it in your PATH.

Requires: Docker installed and running.

Quick Start

cd your-project/

# Start Claude Code (default)
asylum

# Start Gemini CLI
asylum -a gemini

# Start Codex
asylum -a codex

# Interactive shell (no agent)
asylum shell

On first run, Asylum builds a Docker image (~5 min) and seeds agent config from your host. Subsequent runs start in seconds.

See Getting Started for a full walkthrough of your first run.