Open-Source Co-op Anything Lets AI Agents Reverse-Engineer and Build Multiplayer Mods for Single-Player Games

An open-source toolkit released under the MIT license now enables AI coding agents to transform single-player PC games into cooperative multiplayer experiences, with AI-driven automation handling everything from reverse engineering to testing. The project, called Co-op Anything, provides a playbook, skill set, and Model Context Protocol (MCP) server that directs AI agents through two development paths: reviving stalled community co-op mods or reverse-engineering games from scratch to add networked multiplayer support.