MCP auth for AI agents: How to register a Python OAuth client using CIMD

The text provides a comprehensive tutorial on building a confidential AI agent that interacts with MCP servers using OAuth tokens, focusing on the implementation of Client ID Metadata Documents (CIMD) for client identity. It details the process of constructing and hosting a CIMD JSON document and a JWKS endpoint to facilitate secure and scalable OAuth authentication across MCP servers. The tutorial explains the end-to-end flow, starting from client registration, generating and hosting a CIMD document, implementing the OAuth Authorization Code flow with PKCE, and exchanging authorization codes for tokens using a signed client assertion via private_key_jwt. Additionally, it covers the server-side validation processes, including checking JWT claims and verifying the client’s identity, ensuring secure communication. The guide includes Python code snippets for generating key pairs, building JWTs, and conducting token exchanges, emphasizing the importance of exact URL matching and JWT validation in maintaining security and functionality.