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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The Problem with Dynamic Client Registration In my previous deep-dive into MCP authorization, I analyzed how the protocol builds on OAuth 2.1 with mandatory PKCE, Resource Indicators (RFC 8707), and the "Discovery Trifecta" of RFC 7591, 8414, and 9728. Dynamic Client Registration (DCR) was positioned as the key enabler …
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Introduction The Model Context Protocol (MCP) ecosystem mandates OAuth 2.1-compliant authorization servers to facilitate secure, federated access to AI model services. MCP clients, such as Claude Code, Cursor, and VS Code extensions, rely on modern OAuth specifications including Dynamic Client Registration (RFC 7591), …
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