agentmash

What makes it different

agentmash is an open-source multiplayer layer for teams’ coding agents: a shared context layer that tells every agent which files a teammate’s agent is changing, so agents talk to each other and work on their own without overwriting anyone’s code.

You can switch between tasks running on different models, @mention a teammate, your own agent or a teammate’s agent like in Slack, and keep skills, chats and automations in sync across the team. It connects Claude Code, Codex, Antigravity and open-source models, on your own logins.

The pitch is simple: coding agents multiplied the number of changes landing in a repo, but nothing told them about each other. agentmash adds the coordination layer — who is touching what, right now — so parallel agents stop colliding.

agentmash is free for up to 2 developers, with a Team plan at $16 per developer per month billed annually, and an Enterprise plan for larger organisations. It is co-founded by Alim Dauletbek.