Supergateway MCP Proxy

Supergateway is a command-line utility designed to bridge Model Context Protocol (MCP) stdio-based servers with network transports like Server-Sent Events (SSE), WebSockets (WS), and Streamable HTTP, and vice versa. It enables remote access, debugging, and client connectivity for MCP servers that primarily support stdio. The current stable version is 3.4.3. The project demonstrates a relatively active release cadence, with several minor updates and a significant rollback release (v3.4.0) to address stability issues from v3.3.0. Its key differentiator is providing a flexible gateway for various MCP communication patterns, facilitating integration of local stdio services into web-based or distributed systems. It supports both stateless and stateful operations for Streamable HTTP, and offers configurable concurrency for stdio-to-SSE gateways.