Supporting Stateless MCP: A Detailed, Step-by-Step Guide for Clients

The upcoming revision of the Model Context Protocol (MCP), set for release on July 28, 2026, represents a major overhaul by transitioning to a stateless protocol. This change removes the initialize handshake and sessions, ensuring that each tool call is a self-contained HTTP request with its own protocol version, identity, and capabilities. This transformation simplifies scalability, load balancing, and understanding the protocol, as server replicas can independently handle requests without retaining session information. The shift necessitates changes in the MCP client, which now has to explicitly manage tasks that were previously handled implicitly within persistent connections. Key benefits include improved workflows, such as handling human-in-the-loop pauses and managing per-user identity across services, enhancing reliability and security. While the transition to a stateless protocol involves significant updates, particularly in managing authentication and token lifecycles, platforms like Arcade are prepared to support the new spec from the start, ensuring seamless integration and operation.

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