How AI Tools Tell Agents Where Login Lives

Before an AI client can log in to a protected tool, it has to know where the right login system is.In this episode, Satish uses a simple real-life example first, then turns the idea into a practical technical mental model for engineers and curious builders.In Simple Terms with Satish: daily tech trends explained simply, with enough technical depth for builders.Production note: This episode uses authorized synthetic narration based on Satish's own voice. The topic, script, and final editorial approval are by Satish.Engineer notes:Exact technical references:- Latest MCP authorization specification: `2025-11-25`.- RFC 9728 defines OAuth 2.0 protected resource metadata.- MCP servers use protected resource metadata for authorization server discovery.- Discovery can happen through a `WWW-Authenticate` challenge or a standard well-known metadata endpoint.- Client credentials for unattended services still depend on the same discovery layer before token acquisition.Sources:- https://modelcontextprotocol.io/specification/2025-11-25/basic/authorization- https://modelcontextprotocol.io/extensions/auth/oauth-client-credentials- https://www.rfc-editor.org/rfc/rfc9728- https://datatracker.ietf.org/doc/html/rfc7523- https://arxiv.org/abs/2605.22333