The Model Context Protocol (MCP) is undergoing a significant, non-backward-compatible revision set to take effect on July 28, 2026. This update removes the session header, making the protocol stateless to improve scalability and enable simpler load balancing. Consequently, any code relying on session IDs or the initialization handshake will need to be updated. Additionally, error code -32002 is being replaced with -32602, and two new required routing headers, Mcp-Method and Mcp-Name, are being introduced for proxy routing. AI
IMPACT Developers maintaining Model Context Protocol servers must update their code to comply with the stateless revision by July 28, 2026.
RANK_REASON The item describes a protocol revision that impacts existing server implementations, fitting the 'tool' category for software development.
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