Isolated VM environments for running Claude Code and Codex.
Pronunciation: "coop" (/kuːp/) — one syllable, rhymes with "loop", like the thing you keep chickens in. Not "co-op".
coop is a Rust CLI that manages disposable virtual machines where Claude Code and Codex have full tool access: Docker, git, compilers, package managers, all without risk to your host machine. Each VM is isolated, reproducible, and cheap to create and destroy.
Install the latest release:
curl -fsSL https://raw.githubusercontent.com/trailofbits/coop/main/install.sh | bash
Or build from source (requires Rust):
cargo build --release
cp target/release/coop /usr/local/bin/
Then build the VM template image:
coop setup
On Linux, coop setup also installs Firecracker and fetches a guest kernel. On macOS, install Lima first (brew install lima) — setup fails without it. coop is tested on macOS arm64 (Apple Silicon) and Linux x86_64; Linux arm64 builds are available but untested. Each backend has its own host requirements — see Prerequisites.
Keep coop updated:
coop update
See coop update and the updates config section.
Start an instance for the current project and launch an agent CLI:
cd ~/code/my-project
coop up
coop claude
coop codex