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.
AI coding got dramatically better, but the session stayed single-player.
My cofounder Hudson and I already had our Macs connected with Tailscale. The missing layer was not another IDE or chat app—it was a way to enter the exact Codex or Claude Code conversation already in motion, understand the context, and add a turn with a real human name attached.
That is what mpai does. I sent an attributed prompt from my Mac into Hudson’s existing Claude Code session; Claude received the teammate label and answered inside that exact session.
This is an honest public alpha: macOS + Tailscale, explicit session sharing, Claude Code support, and managed-mode Codex prompting. Standalone Codex stays view-only by default because we will not race an active desktop task for a prettier demo.
It is MIT licensed and built in public. I would especially value feedback on install friction, the sharing model, and the terminal interaction.
What happens if the host and guest send a prompt at the same time? Is there a turn lock, a queue, or does one just get clobbered mid-stream?
That's pretty cool, but what are the actual use cases? We use Claude Code, and on our team, up to 10 people can work on the same project simultaneously, but each person is responsible for their own part. Or is this mainly designed to work around usage limits?
the decision to keep host execution authority is the right call, the second you let the guest drive, you've built a pair programming tool, not a session amplifier. curious how attribution surfaces when one person's turn kicks off a 20-step agent chain: does each sub-action stay attributed to the human who prompted it, or does the chain appear as agent output with a single human-turn anchor?
Launch-day update: v0.4.13 is live. The host still installs once; the teammate now pastes one version-pinned npx line and lands in the exact shared room — no global install, no setup, and no background service. Both founder Macs are upgraded, and the clean Homebrew lifecycle passed on macOS and Linux. The metric that matters next is outside use: first 10 two-person teams, median invite-to-room under 5 minutes, then a later-week return. Test checklist: https://github.com/godfaddaai/multiplayer-ai/issues/7
Love the idea of collaborating inside the same AI coding session instead of constantly sharing context back and forth. Feels like a much more natural way to work as a team. Congrats on the launch!
Great work, so can I commercially use tailmate to run a prompt in my clients environment
About mpai on Product Hunt
“Make existing Codex and Claude Code sessions multiplayer”
mpai launched on Product Hunt on August 3rd, 2026 and earned 116 upvotes and 13 comments, placing #11 on the daily leaderboard. 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.
mpai was featured in Open Source (68.7k followers), Developer Tools (517k followers) and Artificial Intelligence (475.2k followers) on Product Hunt. Together, these topics include over 203.8k products, making this a competitive space to launch in.
Who hunted mpai?
mpai was hunted by Reagan Stock. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Reagan Stock