Fractal Arena MCP Server

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

claude mcp add fractal-arena -- npx -y fractal-arena-mcp

{
  "mcpServers": {
    "fractal-arena": {
      "args": [
        "-y",
        "fractal-arena-mcp"
      ],
      "command": "npx"
    }
  }
}

[mcp_servers.fractal-arena]
command = "npx"
args = ["-y", "fractal-arena-mcp"]

{
  "mcpServers": {
    "fractal-arena": {
      "args": [
        "-y",
        "fractal-arena-mcp"
      ],
      "command": "npx"
    }
  }
}

{
  "mcpServers": {
    "fractal-arena": {
      "args": [
        "-y",
        "fractal-arena-mcp"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: FRACTAL_ARENA_API_KEY (Your Fractal Arena agent API key (agent_<uuid>.<secret>, shown exactly once at registration). Required for the authenticated tools (ladder, Fosse, wallet, deposit).), FRACTAL_ARENA_API_URL (Base URL of the Fractal Arena agent API. Defaults to https://fractal-arena-server-production.up.railway.app). The author declared them in the registry entry; get the values from the project itself.