The Evolving Topology of MCP: From Flat to Gateway-Centric

This article discusses how the traditional flat topology of MCP (the host application in the center with radiating MCP servers) is changing as MCP becomes more widely adopted in enterprise environments. A gateway tier is emerging to centralize cross-cutting concerns like authentication, authorization, and observability.

Details

The article explains how the traditional flat topology of MCP, where a host application talks directly to individual MCP servers, becomes problematic at scale. In large deployments with many engineers and shared MCP servers, issues arise around credential management, access control, and observability. This is similar to the problems that drove the adoption of API gateways a decade ago. To address these challenges, a gateway tier is emerging between the host application and MCP servers. Products like Stacklok, MintMCP Gateway, and Traefik Hub implement this pattern, centralizing authentication, policy enforcement, and observability at the gateway level. This allows MCP servers to be stateless translators, focused solely on protocol conversion without managing credentials or security concerns. The article argues that this gateway-centric topology is the natural architectural response to the pressures faced by MCP as it transitions from a developer tool to enterprise infrastructure. It mirrors the evolution of API gateways, providing a centralized security boundary and management layer for the distributed MCP ecosystem.