The Model Context Protocol (MCP) has released a new specification revision, 2026-07-28, which introduces a stateless core by retiring the previous session-based handshake. This update allows MCP servers to operate behind standard load balancers without shared session storage. Key changes include method and tool names being transmitted in HTTP headers for easier routing, support for multi-round-trip requests, and enhanced authorization mechanisms. Notably, OpenAI's Codex was observed already using the new revision shortly after its release, while Claude clients continued to use an earlier version. AI
IMPACT This protocol update could streamline AI agent communication and integration by enabling stateless operations and better routing.
RANK_REASON Update to a specific protocol specification and its adoption by clients.
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