mpai

mpai is an open-source tool that turns single-user AI coding sessions into shared, multiplayer experiences. If your teammate is deep in a Codex or Claude Code conversation on their Mac, you can jump into that exact session from your own terminal — no screen sharing, no transcript pasting, no switching to a new IDE. Your prompts land with your name attached, and the host keeps full control over what's shared.

The tool works as a lightweight coordination layer above existing AI agents. The host installs mpai via Homebrew or npm, picks a running session, and generates a private invite command. A teammate with Node.js 20+ pastes that command and enters the session immediately — no global install, no separate account. mpai uses Tailscale for a private device network, so no public relay is involved. Standout features include live transcript streaming, session switching, role-based access (viewer vs. participant), and an append-only audit trail of every prompt.

mpai is ideal for small engineering teams already using Codex or Claude Code who want to collaborate in real time without losing context. It's especially useful for pair programming, debugging together, or onboarding a teammate into a complex session. The alpha currently supports macOS and requires an existing Tailscale network, but the MIT license and open-source code make it easy to inspect and adapt.