supergateway

Run MCP stdio servers over SSE and SSE over stdio. AI gateway.

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Supergateway is a tool that allows running MCP stdio-based servers over SSE (Server-Sent Events) with one command. It is useful for remote access, debugging, or connecting to SSE-based clients when your MCP server only speaks stdio. The tool supports running in SSE to Stdio mode as well, where it connects to a remote SSE server and exposes a local stdio interface for downstream clients. Supergateway can be used with ngrok to share local MCP servers with remote clients and can also be run in a Docker containerized deployment. It is designed with modularity in mind, ensuring compatibility and ease of use for AI tools exchanging data.

README:

Supergateway runs MCP stdio-based servers over SSE (Server-Sent Events) or WebSockets (WS) with one command. This is useful for remote access, debugging, or connecting to clients when your MCP server only supports stdio.

Supported by Supermachine (hosted MCPs), Superinterface, and Supercorp.

Installation & Usage

Run Supergateway via npx:

npx -y supergateway --stdio "uvx mcp-server-git"

--stdio "command": Command that runs an MCP server over stdio
--sse "https://mcp-server-ab71a6b2-cd55-49d0-adba-562bc85956e3.supermachine.app": SSE URL to connect to (SSE→stdio mode)
--outputTransport stdio | sse | ws: Output MCP transport (default: sse with --stdio, stdio with --sse)
--port 8000: Port to listen on (stdio→SSE or stdio→WS mode, default: 8000)
--baseUrl "http://localhost:8000": Base URL for SSE or WS clients (stdio→SSE mode; optional)
--ssePath "/sse": Path for SSE subscriptions (stdio→SSE mode, default: /sse)
--messagePath "/message": Path for messages (stdio→SSE or stdio→WS mode, default: /message)
--header "Authorization: Bearer 123": Add one or more headers (stdio→SSE or SSE→stdio mode; can be used multiple times)
--logLevel info | none: Controls logging level (default: info). Use none to suppress all logs.
--cors: Enable CORS (stdio→SSE or stdio→WS mode)
--healthEndpoint /healthz: Register one or more endpoints (stdio→SSE or stdio→WS mode; can be used multiple times) that respond with "ok"

stdio → SSE

Expose an MCP stdio server as an SSE server:

npx -y supergateway \
    --stdio "npx -y @modelcontextprotocol/server-filesystem ./my-folder" \
    --port 8000 --baseUrl http://localhost:8000 \
    --ssePath /sse --messagePath /message

Subscribe to events: GET http://localhost:8000/sse
Send messages: POST http://localhost:8000/message

SSE → stdio

Connect to a remote SSE server and expose locally via stdio:

npx -y supergateway --sse "https://mcp-server-ab71a6b2-cd55-49d0-adba-562bc85956e3.supermachine.app"

Useful for integrating remote SSE MCP servers into local command-line environments.

You can also pass headers when sending requests. This is useful for authentication:

npx -y supergateway \
    --sse "https://mcp-server-ab71a6b2-cd55-49d0-adba-562bc85956e3.supermachine.app" \
    --header "Authorization: Bearer some-token" \
    --header "X-My-Header: another-value"

stdio → WS

Expose an MCP stdio server as a WebSocket server:

npx -y supergateway \
    --stdio "npx -y @modelcontextprotocol/server-filesystem ./my-folder" \
    --port 8000 --outputTransport ws --messagePath /message

WebSocket endpoint: ws://localhost:8000/message

Example with MCP Inspector (stdio → SSE mode)

Run Supergateway:

npx -y supergateway --port 8000 \
    --stdio "npx -y @modelcontextprotocol/server-filesystem /Users/MyName/Desktop"

Use MCP Inspector:

npx @modelcontextprotocol/inspector

You can now list tools, resources, or perform MCP actions via Supergateway.

Using with ngrok

Use ngrok to share your local MCP server publicly:

npx -y supergateway --port 8000 \
    --stdio "npx -y @modelcontextprotocol/server-filesystem ."

# In another terminal:
ngrok http 8000

ngrok provides a public URL for remote access.

Running with Docker

A Docker-based workflow avoids local Node.js setup. A ready-to-run Docker image is available here: supercorp/supergateway. Also on GHCR: ghcr.io/supercorp-ai/supergateway

Using the Official Image

docker run -it --rm -p 8000:8000 supercorp/supergateway \
    --stdio "npx -y @modelcontextprotocol/server-filesystem /" \
    --port 8000

Docker pulls the image automatically. The MCP server runs in the container’s root directory (/). You can mount host directories if needed.

Building the Image Yourself

Use provided Dockerfile:

docker build -t supergateway .

docker run -it --rm -p 8000:8000 supergateway \
    --stdio "npx -y @modelcontextprotocol/server-filesystem /" \
    --port 8000

Using with Claude Desktop (SSE → stdio mode)

Claude Desktop can use Supergateway’s SSE→stdio mode.

NPX-based MCP Server Example

{
  "mcpServers": {
    "supermachineExampleNpx": {
      "command": "npx",
      "args": [
        "-y",
        "supergateway",
        "--sse",
        "https://mcp-server-ab71a6b2-cd55-49d0-adba-562bc85956e3.supermachine.app"
      ]
    }
  }
}

Docker-based MCP Server Example

{
  "mcpServers": {
    "supermachineExampleDocker": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "supercorp/supergateway",
        "--sse",
        "https://mcp-server-ab71a6b2-cd55-49d0-adba-562bc85956e3.supermachine.app"
      ]
    }
  }
}

Why MCP?

Model Context Protocol standardizes AI tool interactions. Supergateway converts MCP stdio servers into SSE or WS services, simplifying integration and debugging with web-based or remote clients.

Advanced Configuration

Supergateway emphasizes modularity:

Automatically manages JSON-RPC versioning.
Retransmits package metadata where possible.
stdio→SSE or stdio→WS mode logs via standard output; SSE→stdio mode logs via stderr.

Additional resources

Superargs - provide arguments to MCP servers during runtime.

Contributors

Contributing

Issues and PRs welcome. Please open one if you encounter problems or have feature suggestions.

License

MIT License

For Tasks:

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