mcp-proxy

• mcp-proxy
  • About
  • 1. stdio to SSE/StreamableHTTP
    • 1.1 Configuration
    • 1.2 Example usage
  • 2. SSE to stdio
    • 2.1 Configuration
    • 2.2 Example usage
  • Named Servers
  • Installation
    • Installing via PyPI
    • Installing via Github repository (latest)
    • Installing as container
    • Troubleshooting
  • Extending the container image
  • Docker Compose Setup
  • Command line arguments
    • Example config file
  • Testing

About

The mcp-proxy is a tool that lets you switch between server transports. There are two supported modes:

1. stdio to SSE/StreamableHTTP
2. SSE to stdio

1. stdio to SSE/StreamableHTTP

Run a proxy server from stdio that connects to a remote SSE server.

This mode allows clients like Claude Desktop to communicate to a remote server over SSE even though it is not supported natively.

graph LR
    A["Claude Desktop"] <--> |stdio| B["mcp-proxy"]
    B <--> |SSE| C["External MCP Server"]

    style A fill:#ffe6f9,stroke:#333,color:black,stroke-width:2px
    style B fill:#e6e6ff,stroke:#333,color:black,stroke-width:2px
    style C fill:#e6ffe6,stroke:#333,color:black,stroke-width:2px

1.1 Configuration

This mode requires providing the URL of the MCP Server's SSE endpoint as the program’s first argument. If the server uses Streamable HTTP transport, make sure to enforce it on the mcp-proxy side by passing --transport=streamablehttp.

Arguments

| Name | Required | Description | Example | | ---------------- | -------- | ----------------------------------------------------------------------------------------------------------------- | --------------------------------------------- | | command_or_url | Yes | The MCP server SSE endpoint to connect to | http://example.io/sse | | --headers | No | Headers to use for the MCP server SSE connection | Authorization 'Bearer my-secret-access-token' | | --transport | No | Decides which transport protocol to use when connecting to an MCP server. Can be either 'sse' or 'streamablehttp' | streamablehttp | | --client-id | No | OAuth2 client ID for authentication | your_client_id | | --client-secret| No | OAuth2 client secret for authentication | your_client_secret | | --token-url | No | OAuth2 token endpoint URL for authentication | https://auth.example.com/oauth/token |

Environment Variables

| Name | Required | Description | Example | | ------------------ | -------- | ---

... View full README on GitHub