Vercel Labs just-bash: Virtual In-Memory Bash Environment for AI Agents — 2.6K Stars

GitHub·medium signal

Vercel Labs released just-bash, a TypeScript-based virtual bash environment with an in-memory filesystem designed specifically for AI agent sandboxing. Provides 80+ built-in Unix commands, pipes, redirections, variables, glob patterns, and optional Python/JS/SQLite runtimes — all without touching the host system. Multiple filesystem backends (InMemoryFs, OverlayFs, ReadWriteFs, MountableFs) offer configurable security/access tradeoffs. At 2.6K stars, this is a new sandboxing primitive for agent tool execution.