MCP's Largest Version Update: How Stateless Core Enables AI Agents to Truly Enter Production

On July 28, 2026, the Model Context Protocol released its 2026-07-28 specification, marking the largest revision since the protocol launched: the initialize handshake and Mcp-Session-Id have been removed, and the protocol has shifted to a stateless HTTP request/response model, enabling servers to be deployed on Serverless platforms and behind standard load balancers. MCP Apps and Tasks have graduated to official extensions, OAuth 2.0 authorization synchronization has been strengthened, and full support for Claude will be rolled out gradually. This article sorts out six key points including SEP stateless transformation, extension framework, enterprise authorization essentials, and breaking change migration suggestions for production environment evaluation and reference.