Jensen MCP endpoint (Schall & Rauch) POST /mcp Streamable HTTP MCP, Bearer token required GET /.well-known/oauth-protected-resource RFC 9728 GET /.well-known/oauth-authorization-server RFC 8414 POST /register dynamic client registration (RFC 7591) GET /authorize OAuth 2.1 authorization code + PKCE (S256) POST /token authorization_code, refresh_token POST /revoke RFC 7009 Connect from Claude (custom connector) or ChatGPT (Developer Mode) with the URL of /mcp.