MCP goes stateless

The Model Context Protocol shipped its fifth spec release today: MCP 2026-07-28. If you serve MCP from a static site, this is the release where the spec catches up with you. The headline change is a stateless core: the protocol drops from a bidirectional, session-based design to plain request/response. Anthropic’s announcement frames this as making MCP servers easier to build and scale, and it does. It also makes the smallest possible MCP server, a static site with one function, the shape the protocol now assumes. Pages for humans, tools for agents Last week I argued that the website is becoming a bundle of interfaces: one for humans, several for machines, and the machine ones don’t just answer questions, they take actions. An MCP server is one of those machine interfaces: the plug through which AI assistants use a site rather than just read it. The distinction matters. Everything else I’ve done to make this blog agent-friendly helps agents read: markdown versions of every page,…