MCP Architecture Diagram Examples

These MCP examples show how the same host-protocol-server model scales from a single local server to a host orchestrating many remote ones, plus how a custom server wraps your own systems.

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Real examples

Single-server setup (the simplest MCP)

Who uses it: Developer adding their first MCP server to an app

Host: a desktop AI app with one MCP client

One server: filesystem access over stdio

Resource: a local project folder

Protocol: JSON-RPC, server runs as a child process

No auth needed — local, single-user

Why this works: The single-server case is the cleanest way to understand MCP — one client, one server, one resource — before adding the complexity of multiple servers or remote transport.

Multi-server host

Who uses it: Team building an assistant that touches many systems

Host runs multiple MCP clients, one per server

Servers: filesystem, Git, database, web search

The LLM picks which server's tools to call per request

Each server is independently versioned and deployable

Adding a capability = adding a server, not changing the host

Why this works: The multi-server pattern is where MCP earns its keep — instead of building N custom integrations into your app, you add servers that all speak the same protocol, so capabilities compose.

Custom MCP server

Who uses it: Engineer exposing an internal API to AI hosts

Custom server wraps an internal REST API

Exposes a small set of MCP tools (search, create, update)

Translates MCP tool calls into authenticated API requests

Any MCP-compatible host can now use it with no host changes

Resource behind it: the internal service + its database

Why this works: A custom server is how you make a proprietary system MCP-native — you write the server once, and every MCP host (different IDEs, chat apps, agents) gains access without each one writing a bespoke integration.

Remote MCP server

Who uses it: Team deploying a shared server for many users

Server runs as a remote service over HTTP + SSE

Multiple hosts connect to the same server instance

OAuth handles per-user authentication and scopes

Server is centrally maintained and monitored

Resource: a shared SaaS backend

Why this works: Remote MCP moves servers from a local child process to a hosted service — the diagram changes by adding an auth layer and showing many hosts connecting to one server, which is the model for shared, multi-tenant capabilities.

Tips for better study mind maps

Keep the host and servers in separate frames — the trust and deployment boundary between them is the whole point of MCP.
Show the resource behind each server as a distinct node; the server is a bridge, not the data itself.
Label the connection as JSON-RPC / MCP protocol so readers know it's a standard, not a custom API.
For remote setups, add an auth layer on the protocol link rather than inside a server box.

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