
#45 - Should You Block AI Agents? OAuth, MCP, and Who Gets In
Should you block AI agents? This episode answers it from the identity chair, and it starts with MCP authorization explained from zero. If you've heard "MCP authentication" and "OAuth" in the same breath all year and never quite connected them, this episode does it step by step. We starts with OAuth 2.1 from scratch (what the roles are, what a token actually is, why it's not login), then MCP from scratch (what the Model Context Protocol is, local versus remote servers, why an AI agent is unlike any API client you'vesecured before), then walks the full MCP authorization handshake with the July 28, 2026 spec open: the 401, Protected Resource Metadata, Client ID Metadata Documents, PKCE, resource indicators, issuer validation, audience binding,step-up scopes, and the two rules that matter most. Then why this lands on the identity leader's desk, and the question the CISO will actually ask: do we let agents in at all? We walk the block-or-admit debate, the August 2026 Ninth Circuit ruling in Amazon v. Perplexity, why the fraud bouncer can't tell a goodagent from an account-takeover bot, the screen-scraping-to-open-banking precedent, what Reg E and Reg Z do with "my agent did it," the managed-delegation posture (block anonymous agents, admit authenticated ones),and the two controls to turn up now, step-up authentication on anything that moves money and behavior baselining for the agent itself. Then gotchas, anti-patterns, and a Monday list. T Why this episode now OAuth has never been easier to learn, and MCP authorization guides exist, mostly written for developers building servers. This episode connects the two from the identity practitioner's chair: a six-minute OAuth refresher, MCP from zero, the handshake told as one scene (an intern walking up to room 412), what it changes about running an identity platform, the block-or-admit question for customer-facing agents, and why every change in the MCP spec this year was an OAuth lesson from years ago. Thank you for listening LinkedIn: https://www.linkedin.com/in/rohit-agnihotri Email: theIdentityNavigator@gmail.com



