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CyanMycelium MCP Broker

io.github.pandaGaume/mcp-broker ยท v1.12.0

One host and one port for many MCP servers: browsers, devices, simulators and stdio tools.

Website Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add mcp-broker -e MCP_BROKER_STDIO_PROVIDER=<MCP_BROKER_STDIO_PROVIDER> -e MCP_BROKER_PORT=<MCP_BROKER_PORT> -e MCP_BROKER_HOST=<MCP_BROKER_HOST> -- npx -y @cyanmycelium/[email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "mcp-broker": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanmycelium/[email protected]"
      ],
      "env": {
        "MCP_BROKER_STDIO_PROVIDER": "<MCP_BROKER_STDIO_PROVIDER>",
        "MCP_BROKER_PORT": "<MCP_BROKER_PORT>",
        "MCP_BROKER_HOST": "<MCP_BROKER_HOST>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "mcp-broker": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanmycelium/[email protected]"
      ],
      "env": {
        "MCP_BROKER_STDIO_PROVIDER": "<MCP_BROKER_STDIO_PROVIDER>",
        "MCP_BROKER_PORT": "<MCP_BROKER_PORT>",
        "MCP_BROKER_HOST": "<MCP_BROKER_HOST>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "mcp-broker": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cyanmycelium/[email protected]"
      ],
      "env": {
        "MCP_BROKER_STDIO_PROVIDER": "<MCP_BROKER_STDIO_PROVIDER>",
        "MCP_BROKER_PORT": "<MCP_BROKER_PORT>",
        "MCP_BROKER_HOST": "<MCP_BROKER_HOST>"
      }
    }
  }
}

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
MCP_BROKER_STDIO_PROVIDER
Optional		Slot bridged to stdio. Keep _all: it exists before any provider connects and aggregates every opted-in provider.
MCP_BROKER_PORT
Optional		TCP port for provider tunnels (ws://<host>:<port>/provider/<slot>) and client transports (/<slot>/mcp). One broker per port.
MCP_BROKER_HOST
Optional		Interface to bind. 127.0.0.1 keeps the broker private to this machine; 0.0.0.0 exposes it on the network.

Details

Package@cyanmycelium/[email protected] (NPM, stdio)
First published15 Nov 2026
Last updated15 Nov 2026
Registry nameio.github.pandaGaume/mcp-broker

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