Technical Deconstruction of MCP Authorization: A Deep Dive into OAuth 2.1 and IETF RFC Specifications
Nov 12, 2025 · 22 min read · MCP Model Context Protocol OAuth 2.1 OAuth 2.0 PKCE JWT RFC 7636 RFC 9700 RFC 9728 Resource Indicators Federated Authentication AI Security ·
Executive Summary This article provides a deep-dive technical analysis of the Model Context Protocol (MCP) authorization flow. The central insight is that MCP's authorization model is not a generic application of OAuth 2.0 but a sophisticated implementation of the emerging OAuth 2.1 standard. The MCP protocol …
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