The next generation of MCP

Over the last year and a half, the Model Context Protocol (MCP) has become the universal standard for how agents interact with external services. But one of the main criticisms of MCP was that the protocol required a stateful connection between Client and Server. This evolved from MCP’s origins and the first STDIO transport, designed for local applications . When MCP Servers went remote, it translated the stateful connection that worked so well locally and transposed it onto web infrastructure. Building a well-behaved MCP Server meant managing request routing to sticky sessions, holding open streams, message replay, and generally more overhead and complexity than a traditional web server. This changes now. The latest MCP 2026-07-28 specification was released last week, together with updated TypeScript, Python, Go, and C# SDKs. MCP is now a fully stateless protocol. The specification, interaction model and SDKs have all been rewritten to leverage this new protocol and simplify usage. This means that MCP servers can now run in just a Worker, no stateful infrastructure needed, and customers benefit from the operational simplicity and reduced cost of less moving parts. A new MCP At Cloudflare, our journey with MCP goes back to the very beginning. In March 2025, we released our McpAgent primitive for building MCP servers with Cloudflare Agents SDK . Two months later, we ran an MCP Demo Day showcasing customers such as Asana, Atlassian, Block, Intercom, Linear, PayPal, Sentry, Stripe, and Webflow launching their own MCP Servers along with 13 Cloudflare product-specific MCP servers . A year ago, we released MCP Server Portals , to help enterprises securely adopt MCP in their organisations. Cloudflare Durable Objects were uniquely positioned to be the best place to host these new applications. They are stateful servers that combine compute, persistent transactional storage (via embedded SQLite), and real-time coordination. They scale up on demand, hibernate when not in use, and keep the stateful connection needed by MCP for Agent-to-Human interaction. McpAgent combined with the Workers OAuth Provider package was the best place to host remote MCP servers. However, it became apparent that MCP could be simpler, more efficient, and easier to host, while keeping all capabilities we have grown to love. This release of the MCP 2026-07-28 specification has been months of work by the whole MCP team and the SDK maintainers. In this post, we will outline the protocol chan...