How to Build Scalable MCP Servers with Platformatic, Node.js, and Auth0

Learn how to build and scale stateful Model Context Protocol (MCP) servers using Node.js, Platformatic, and Fastify. In this practical guide, Matteo Collina (Co-Founder & CTO of Platformatic) demonstrates how to solve the complex challenges of scaling AI agents and securing them with Auth0.

You'll move beyond simple STDIO servers to build HTTP streaming servers that are scalable and secure, using `@platformatic/mcp` to manage state externally with tools like Redis. Then, see a live demo of how to implement authentication using Auth0 to secure your MCP Server.

💡 What You'll Learn
* What MCP (Model Context Protocol) is and how it works.
* The architecture of "The Agentic Loop" for AI agents.
* The critical problem with scaling stateful MCP servers.
* How to use `@platformatic/mcp` and Redis to build scalable, distributed systems.
* How to implement secure OAuth 2.0 authentication for your MCP servers using Auth0.

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➡️ Related Videos & Resources
* Build an MCP in Python https://youtu.be/0CWAzbduYZs
* Auth0 MCP Server in VS Code https://youtu.be/z2vqwAA0byo

### 🛠️ Links & Tools
* Platformatic MCP on GitHub: https://github.com/platformatic/mcp
* Platformatic: https://platformatic.dev/
* Auth0: https://auth0.com/
* Fastify: https://fastify.dev/

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⏰ Timestamps
00:00 - Introduction to MCP Servers
00:18 - Meet the Speaker: Matteo Collina
00:54 - What is MCP (Model Context Protocol)?
01:49 - Understanding The Agentic Loop
02:30 - MCP & Server-Sent Events (SSE)
03:38 - Two Kinds of MCP Servers: STDIO vs HTTP Streaming
05:00 - The Core Scaling Problem (Stateful SDKs)
05:28 - Introducing @platformatic/mcp
06:04 - How to Implement Authentication? (Using Auth0)
06:37 - OAuth Integration for MCP (Dynamic Client Registration)
07:16 - Demo Part 1: Auth0 Tenant Setup
09:17 - Demo Part 2: Live Code Demo
09:27 - Code Review: oauth2-user-server.ts
10:19 - Live Demo: Running the Claude AI CLI
10:55 - Live Demo: Authenticating the AI Agent with Auth0
11:27 - Live Demo: AI successfully uses the secured tool
12:11 - Wrap-up & Final Thoughts

Open DCR enables flexible MCP integrations but exposes your tenant to potential abuse if left unauthenticated. Without security controls, anyone can create applications in your tenant, potentially leading to resource exhaustion, unauthorized access attempts, or tenant misconfiguration. Read the documentation on Securing Open Dynamic Client Registration (DCR) here: https://a0.to/securing-open-dcr

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Have a topic you'd like to see covered? Let us know if the comments below 👀

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