Major Version Update of MCP: Stateless Core, Official Extensions and Enterprise-level Certification
On July 28, 2026, the Model Context Protocol released its 2026-07-28 specification, marking the largest revision since the protocol's launch. The core changes include: shifting from a bidirectional stateful protocol to a request/response stateless model, removing the initialize handshake and Mcp-Session-Id; upgrading MCP Apps and Tasks to official extensions; and strengthening OAuth 2.0/OIDC authentication to integrate with enterprise IdPs. With monthly SDK downloads exceeding 400 million and over 950 Claude connectors, MCP is becoming the de facto standard for Agent interconnection.
Read MoreMCP's Largest-Ever Update: Stateless Core Shift on 2026-07-28, Agent Infrastructure Goes Enterprise-Grade
On July 28, 2026, the Model Context Protocol released its 2026-07-28 specification: the core of the protocol has shifted from a bidirectional stateful model to a stateless request/response architecture, the initialize handshake and Mcp-Session-Id have been deprecated, and it now supports any instance handling requests after load balancing. It simultaneously introduces MRTR multi-turn interaction, Mcp-Method/Mcp-Name header routing, and list response cache hints, and graduates MCP Apps, Tasks and enterprise managed authorization to official extensions. OAuth hardening includes RFC 9207 iss verification and DCR migration to CIMD. The monthly downloads of Tier 1 SDKs are nearly 500 million, and companies such as Anthropic and Google Cloud have stated that this is a key step toward the productionization of Agents.
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