Model Context Protocol Releases July 28, 2026 Update: Remove Session, Move Towards Stateless HTTP Deployment

On July 28, 2026, MCP officially released the 2026-07-28 edition specification. The core of the protocol has been changed from a stateless bidirectional model to a stateless request/response model: the initialize handshake and Mcp-Session-Id have been removed, server/discover and Mcp-Method header routing have been added, and list responses support ttlMs caching. SEP-2567 replaces the Session scope with an explicit state handle, and MRTR retains the mid-interaction capability of tools. Extensions such as MCP Apps and Tasks have been formalized, and AWS Bedrock AgentCore, Netlify and others have expressed their support. This article sorts out the key points of the changes and production migration recommendations.