Predictable mcp. subdomain plus SEP-2127 discovery for hosted MCP services
RevolutionaryRoad911 · reddit · 2026-11-04
The author runs a public read-only MCP service at a predictable mcp.<domain> subdomain with the Streamable HTTP endpoint at the subdomain root, decoupled from the main site. To solve client address-guessing, they propose layering SEP-2127 discovery: a /.well-known/ai-catalog.json on the main domain, a server-card endpoint for identity/connection details, while the subdomain root remains the actual MCP endpoint. They ask whether clients actually consume the catalog today and whether others favor this layout over a main-domain /mcp path.
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