MCP Core Turns Stateless in Biggest Update Since 2025 Launch
Updated
Updated · Ars Technica · Jul 30
MCP Core Turns Stateless in Biggest Update Since 2025 Launch
3 articles · Updated · Ars Technica · Jul 30
Summary
MCP’s protocol core has shifted from a bidirectional stateful design to a stateless request/response model, marking the open standard’s largest update since remote MCP launched more than a year ago.
The change removes dependence on sessions tied to individual server instances, a redesign maintainers said targets long-standing enterprise scaling limits and developer demands for better reliability.
The release also adds multi round-trip requests, header-based routing, cacheable list results, authorization hardening, a formal extensions framework and updated Tier 1 SDKs.
MCP underpins how AI systems connect to external tools and data sources, so the overhaul is aimed at making production deployments easier to scale across enterprise infrastructure.