Net Forge

Net Forge is the open-source multiplayer browser game engine built for AI coding agents.

It is MIT licensed, published on npm under @netforge, with source at github.com/netnetdev/net-forge. The documentation is at /docs.

What it is

One game simulation that runs the same in the browser and on the server, with Rapier physics and a fixed tick.
A three.js renderer on WebGPU, with a WebGL2 fallback.
Ten complete multiplayer game templates: survivor-like co-op, arena shooter, tower defense, dungeon crawler, idle, platformer, card battler, monster collector, kart racer and party game.
A typed, declarative game API that coding agents can read, write and test.
An asset library of 530 CC0 models and sounds in six art styles.

Create a project from a template and play it on your own computer with play money:

npm create netforge@latest my-game -- --template survivor --yes
cd my-game
npm run play

Open the same link in a second tab and you are two players in one room. The quickstart covers the other nine templates and what to edit first.

Add the Net Forge MCP server to Claude Code:

claude mcp add netforge -- npx -y @netforge/mcp

Or write the agent instructions and MCP configs into a game folder:

npx netforge setup agent

The agents guide has the lines for Cursor, VS Code, Codex and Gemini CLI.

Read the full documentation at forge.netnet.capital/docs. It is also available as markdown for AI assistants at /llms.txt.

Net Forge is not affiliated with other projects named NetForge.