just-bash

just-bash is a sandboxed bash environment that runs in TypeScript with an in-memory virtual filesystem, designed for AI agents to execute shell commands safely. Built by Vercel Labs, it provides a simulated bash interpreter that can be installed via npm and integrated into applications through a simple API.

The tool allows developers to execute bash commands programmatically without spawning actual system processes, making it suitable for environments where direct shell access is restricted or unsafe. It supports standard bash operations like piping, file operations, and command execution, all contained within a virtual filesystem sandbox.