Anthropic ships MCP 2026-07-28, moving the protocol to a stateless core
Anthropic released the fifth Model Context Protocol spec, shifting MCP from a stateful, bidirectional protocol to a request/response model so servers can run on serverless and edge infrastructure, while hardening OAuth/OIDC authorization and adding a research-preview "MCP Tunnels" feature for reaching internal servers without exposing them to the internet.
why it mattersMCP has passed 400M monthly SDK downloads this year and is now the de facto standard for connecting agents to tools.