Running MCP Servers in Production: agentgateway + ToolHive, from stdio to a Multiplexed HTTP Endpoint

A practical walkthrough of running MCP servers in production — ToolHive hosts the stdio servers, agentgateway multiplexes them behind one endpoint — with four ways to secure the stack (Context7-style per-user API keys, Keycloak OAuth via the MCP Authorization spec, per-tool CEL authorization, and OIDC browser login for the Admin UI), working configs, live verification, and links into the agentgateway and ToolHive docs.