Local network discoverability for Streamable HTTP MCP servers

[emileberhard]

Pre-submission Checklist

• I have verified this would not be more appropriate as a feature request in a specific repository
• I have searched existing discussions to avoid duplicates

Your Idea

Zero-config local discoverability in MCP's streamable HTTP spec

Does anyone know if MCP’s latest streamable HTTP specification (2025-03-26) includes features or support for local network discoverability?

I think having native support for zero-config discovery on local networks (perhaps leveraging mDNS/Bonjour or similar) could significantly enhance usability. Think similar to how Chromecast devices work, where any device can discover and interact with them effortlessly as long as they're connected to the same local network. Imagine how smooth it would be: any guest who connects to your WiFi could seamlessly control smart home devices—lights, TV, heating, etc.—using their preferred LLM assistant (like ChatGPT, Claude, Gemini, Siri, and others). This would remove all setup friction and make the protocol incredibly user-friendly for everyday scenarios.

Curious if this is already on the roadmap or if others find this idea valuable?

Scope

• Protocol Specification
• SDK Features
• Documentation
• Developer Experience
• Other

[Jeff-Bouchard]

+1 I think a MCP-server with nmap as tool to scan local subnet on specific port seems a sensible way; not sure these endpoints should scream their existence away like that and become sitting ducks asking for trouble, locally or not it should be the same imo
what do you think?