Anthropic’s Model Context Protocol is undergoing its most substantial overhaul since launch with the 2026-07-28 revision, shifting from a stateful to a stateless architecture to improve cloud scalability. The update removes protocol-level sessions in favor of independent request handling and deprecates rarely used features such as sampling and roots functionality. Developers on official SDKs should be able to upgrade smoothly, but teams with custom implementations face significant reconfiguration work since the changes are not fully backward compatible with legacy systems.
