Building an MCP server with OAuth and Cloudflare Workers

The article by Edwin Lim provides a comprehensive guide on securing a Model Context Protocol (MCP) server with OAuth for authentication, focusing on a full-stack application that integrates a REST API and an MCP server to power a todo list app accessible by both users and AI agents. It details the OAuth flow, where users authenticate via Stytch's authorization server, which issues JWT tokens for managing the authentication process. The application architecture comprises a React frontend, a serverless backend using the Hono framework, and an MCP server utilizing Cloudflare Workers for deployment. The article explains how to set up and configure a Stytch account for OAuth, manage authentication with middleware functions, and implement OAuth endpoints, including dynamic client registration, authorization, and token exchange. Additionally, it highlights the use of Stytch's Connected Apps feature to streamline the OAuth process, offering secure and scalable authentication for AI agents without building the infrastructure from scratch.

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