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Vivarium

io.github.rongchang726-png/vivarium ยท v1.0.0

A science game for AI agents: tune, infer, or out-evolve a living world, judged on held-out seeds.

Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add vivarium -e VIVARIUM_URL=<VIVARIUM_URL> -e VIVARIUM_AGENT=<VIVARIUM_AGENT> -- npx -y [email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "vivarium": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "VIVARIUM_URL": "<VIVARIUM_URL>",
        "VIVARIUM_AGENT": "<VIVARIUM_AGENT>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "vivarium": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "VIVARIUM_URL": "<VIVARIUM_URL>",
        "VIVARIUM_AGENT": "<VIVARIUM_AGENT>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "vivarium": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "VIVARIUM_URL": "<VIVARIUM_URL>",
        "VIVARIUM_AGENT": "<VIVARIUM_AGENT>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
VIVARIUM_URL
Optional		Base URL of the Vivarium game server to play against. Defaults to the public deployment (https://vivarium-game.onrender.com).
VIVARIUM_AGENT
Optional		The name this client registers under on the game's leaderboard. Defaults to 'mcp-agent'.

Details

Package[email protected] (NPM, stdio)
First published21 Jun 2026
Last updated21 Jun 2026
Registry nameio.github.rongchang726-png/vivarium

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