supergateway

Supergateway MCP Transport Proxy by Supercorp

Run MCP stdio servers over SSE, Streamable HTTP or visa versa

Live Registry Versionv4.2.0Previous: v4.1.0Published 2026-10-15

Stability Grade

B+ (86/100)

90-Day Velocity

3 releases

Stable release cadence

Dependencies

12 direct

NPM manifest

License

MIT

Verified on NPM

Recommended Exact Pin: npx -y supergateway@4.2.0

NPM Registry ->GitHub Repo ->

TL;DR Verdict & Quick Citation Summary (2026-10-24)Source: AgentBreakWatch Live NPM Index

Supergateway MCP Transport Proxy (supergateway) is currently at v4.2.0 on NPM (published 2026-10-15), with a 90-day stability score of 86/100 (B+) and MEDIUM schema drift risk across 3 releases in the past 90 days. v4.x adds stateful/stateless Streamable HTTP output flags (--outputTransport streamableHttp) alongside SSE and WS. Production teams should pin npx -y supergateway@4.2.0 rather than using unpinned @latest tags.

Breaking Changes & Tool Schema Drift Analysis

v4.x adds stateful/stateless Streamable HTTP output flags (--outputTransport streamableHttp) alongside SSE and WS.

Watched Exports / MCP Tool Signatures:

supergateway

Before (Deprecated / Unpinned Pattern)

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

After (Verified v4.2.0 Pattern)

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

Frequently Asked Questions: supergateway

What is the latest version of supergateway on NPM?

As of 2026-10-24, the latest stable version of supergateway (Supergateway MCP Transport Proxy by Supercorp) on NPM is v4.2.0, published on 2026-10-15. It has shipped 3 releases in the last 90 days.

Does supergateway v4.2.0 have breaking changes or MCP schema drift risk?

supergateway currently carries a MEDIUM schema drift risk rating with a Stability Score of 86/100 (Grade B+). v4.x adds stateful/stateless Streamable HTTP output flags (--outputTransport streamableHttp) alongside SSE and WS.

How do I safely pin supergateway in production?

Avoid unpinned @latest tags in production agent configs. Pin the exact verified version using `npx -y supergateway@4.2.0` and monitor supergateway for parameter or schema changes.

30-Min Registry & Schema Poller

Get Instant Breaking-Change Alerts for supergateway

We poll NPM and supercorp-ai/supergateway every 30 minutes. Get an email with the exact diff when supergateway ships a breaking release beyond v4.2.0.