Devvm.dev: One VM for every project

Devvm.dev is a free, open-source tool that creates isolated virtual machines for individual projects, allowing developers or AI coding agents to work safely without access to sensitive system files like SSH keys or AWS credentials. The tool automatically detects required toolchains from project files, supports multiple coding agents (Claude Code, Codex, opencode), and routes all network traffic through a proxy on the host machine to control what the agent can access. Installation is simple via Homebrew on macOS or a shell script on Linux, and users can start an agent in their project's VM with just a few commands.