GPT MCP Proxy

A REST API server that provides HTTP access to Multiple Command Protocol (MCP) tools. This server acts as a bridge between HTTP clients and MCP-compliant tool servers, allowing tools to be discovered and executed via REST endpoints. This is very useful for integrating MCP tools with custom GPT through Actions.

Features

List available MCP servers and their tools
Get detailed information about specific tools
Execute tools with custom parameters
OpenAPI 3.1.0 specification
Automatic public HTTPS exposure via ngrok

Prerequisites

Go 1.20 or later
ngrok account and authtoken
MCP-compliant tools

Configuration

The server requires the following environment variables:

NGROK_AUTH_TOKEN=your_ngrok_auth_token
NGROK_DOMAIN=your_ngrok_domain
MCP_CONFIG_FILE=/path/to/mcp_settings.json  # Optional, defaults to mcp_settings.json

Configuration File Format

Create an mcp_settings.json file with your MCP server configurations:

{
  "mcpServers": {
    "filesystem": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem",
        "/Users/username/Desktop",
        "/path/to/other/allowed/dir"
      ]
    }
  }
}

API Endpoints

GET /openapi.json - OpenAPI specification
GET /mcp/servers - List all servers and their tools
GET /mcp/{serverName} - Get server details
GET /mcp/{serverName}/tools/{toolName} - Get tool details
POST /mcp/{serverName}/tools/{toolName}/execute - Execute a tool

Usage

Set up environment variables
Prepare configuration file
Run the server:

go run main.go

Development

To build from source:

git clone https://github.com/wricardo/mcp-http-server.git
cd mcp-http-server
go build

License

MIT License

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

GPT-MCP-Proxy