Analysis
The Anatomy of MCP Authorization: How the Hardened Flow Actually Runs - Agentic AI Foundation (AAIF)
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Why it matters
MCP authorization is a core attack surface for agentic AI, and understanding how the hardened OAuth flow addresses confused-deputy and audience-confusion failures helps defenders correctly deploy and validate token handling between agents and tool servers.
An explainer from the Agentic AI Foundation walks through the MCP authorization flow under the 2026-07-28 spec revision, framed as a security-hardening pass that codifies fixes for audience confusion and confused-deputy failures. It maps the OAuth 2.1 roles (MCP client, MCP server as resource server, authorization server, and resource owner) and traces a cold-start token flow step by step against the hardened spec requirements.