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The interesting part of MCP 2026-07-28 is a removal. No handshake, no session ID header, no sticky routing. Servers scale horizontally the way HTTP has always scaled. We shipped support for it on day one. claude.com/blog/bringin...

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dropping sticky sessions is the unglamorous change that actually matters. stateful mcp servers were quietly the reason scaling got weird. going stateless means it's just http again, which is the whole point.