Coop Anything

Coop Anything is an AI agent toolkit that researches, reverse engineers, and builds multiplayer co-op for single-player PC and console games.

Coop Anything is a development framework and MCP server that directs AI coding agents to add co-op multiplayer to single-player games. Users point their agent at the repository, and the agent either revives abandoned mods or builds new netcode, engine hooks, and scripts from scratch. It supports a wide variety of engines including Unity, Unreal, Bethesda titles, RE Engine, and emulated console games. The toolkit utilizes Steam relay networking so players can connect easily without port forwarding. It is designed for gamers and developers who want to play single-player titles with friends online or in split-screen.

Coop Anything at a glance

Best for: Software engineer
Runs on: Web, Windows, Linux, API, self-hosted, open source
Pricing: Free and open source under the MIT license.
Released: October 2026
Category: AI agent tool
Website: github.com/cranebeaker/coop-anything

Key features

Search co-op directories via MCP server
Detect game engines from install folders
Reverse engineer closed binaries and engines
Fix abandoned or buggy co-op mods
Build script mods and harmony patches
Set up Steam relay networking
Run automated tests with game bots
Package mods for one-click installation

Use it for

Play single-player games with friends online
Revive abandoned or broken game mods
Add split-screen support to PC and console games
Reverse engineer game engines for multiplayer

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