I spent a week debugging OAuth2 flows across Claude and ChatGPT so you don't have to. Here's everything I learned about securing MCP servers with Ory Hydra. Tagged with oauth2, mcp, claude, chatgpt.

TIL is a community-driven platform for sharing and discovering interesting facts, trivia, and insights on a wide range of topics. Through user submissions and comments, TIL offers insights into obscure facts, historical events, scientific discoveries, and cultural phenomena. Readers can learn something new every day and contribute their own knowledge to the community by sharing interesting tidbits and trivia.

This is Learning

OAuth2 implementation for Model Context Protocol (MCP) servers using Ory Hydra and Kratos. Covers Dynamic Client Registration, token introspection, social login via GitHub, and compatibility testing across Claude (Desktop, CLI, Web) and ChatGPT clients. Documents five critical bugs encountered during implementation, including Claude's DCR validation failures and missing scope parameters, with working solutions including a DCR proxy pattern. Includes production security checklist and comparison of OAuth2 support across AI assistant platforms.

Securing MCP Servers with OAuth2: Ory Hydra + Claude Code + ChatGPT

Part 2: GitHub Social Login (Optional but Recommended)