OAuth flow detailed for remote MCP server authentication in AI tools

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A developer explains the OAuth 2.1 process for authenticating remote MCP servers in clients like Claude and Cursor. The flow begins when a tool requiring protected data, such as blog management, returns a 401 error with a specific WWW-Authenticate header. This header directs the client to metadata endpoints to discover the authorization server and required scopes. The client then uses standard OAuth protocols to obtain a bearer token scoped specifically for that resource server. The example uses a live server at justblogged.com to demonstrate the real, standards-based handshake.

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