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coop-anything

Agent skills and playbooks for adding co-op to single-player PC games

Website ↗ (opens in a new tab)Repository on GitHub ↗ (opens in a new tab)
Stars
2.1k
License
MIT
Last commit
Nov 2026
Language
Python
Stars, last 4 weeks+2,051
13 Oct 2026: 9 stars20 Oct 2026: 734 stars27 Oct 2026: 1,512 stars3 Nov 2026: 1,869 stars10 Nov 2026: 2,060 stars

9 on 13 Oct 20262,060 on 10 Nov 2026

From GitHub's daily star counts.

Checked on GitHub.

Overview

An AGENTS.md, a set of agent skills and an MCP server that guide a coding agent through reviving an abandoned co-op mod or reverse engineering a game to build one. It also ships Python and C++ sync-testing tools (UDP chaos relay, desync analyzer, fuzzer, bots) and a directory of 230+ co-op mods. Finished mods use Steam relay networking via Valve's Spacewar test app.

Who it is for: Gamers and modders who want a coding agent to make single-player games co-op

Strengths

  • Two defined workflows: revive an existing mod, or build from zero, each with named skills
  • Game-agnostic sync test tools with tests and one command (`tools/test_all.py`) that prints ALL OK
  • MCP server detects a game's engine from its install folder and searches the co-op directory
  • Five games with release repos, including Deus Ex marked as released

Weaknesses

  • Output quality depends on the coding agent and hours spent; README gives no success rates
  • Engine-specific work needs tools like Ghidra, BepInEx or UE4SS, installed separately
  • Mostly Windows game modding; Linux and macOS support is only noted for split-screen via PartyDeck
  • Relies on Valve's Spacewar test app for networking, not a dedicated relay

What it needs

  • Needs AI coding agent (Claude Code, Codex, Gemini CLI, Cursor, OpenCode), Python, Steam, The target game

Quick answers

Is coop-anything open source?

Yes. Its code is on GitHub under the MIT license.

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