My cofounder Hudson and I already had our Macs connected with Tailscale, but our Codex and Claude Code sessions were still isolated. If one of us was 40 turns deep, the other got a summary, a screen share, or a finished commit not the conversation itself.
We built mpai around a narrower bet: do not replace the terminal or the native agent. Let a trusted teammate enter an explicitly shared session, arrive with its real context, and add an attributed turn from their own Mac.
The public alpha works with Claude Code and managed-mode Codex. The host stays in control, and standalone Codex remains view-only by default.
Where should the trust boundary land for teams? Is an owner-controlled shared session meaningfully better than moving everyone into a hosted collaborative IDE, or does it still feel too close to remote access?
Open-source terminal multiplayer for Codex and Claude Code. Join a teammate's explicitly shared native session from another Mac, arrive with the real context, and prompt with your name attached. Tailscale stays private; the host Mac stays in control.
