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MCP Goes Stateless: What the July 2026 Spec Change Means for AI Integrations

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The Model Context Protocol (MCP) released a major spec update on July 28, 2026, introducing a fully stateless architecture for connecting to MCP servers. The update removes initialization handshakes and session IDs, which were previously required to establish shared capabilities between clients and servers before any tool or resource could be used. Each request now carries its own protocol version and client metadata, making it independently processable without relying on server-side state. Key MCP headers such as MCP-Protocol-Version, Mcp-Method, and Mcp-Name must be mirrored in both the HTTP header and the request body. Developers using FastMCP 4 get stateless support out of the box, while those on older versions can enable it via the stateless_http=True flag, though upgrading to FastMCP 4 is recommended for full spec compliance.

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MCP Goes Stateless: What the July 2026 Spec Change Means for AI Integrations · ShortSingh