#protocol

A dark comparison-matrix style cover listing the MCP 2026-07-28 spec rewrite's changes: Mcp-Session-Id removed, initialize handshake replaced by _meta fields, server/discover now required, and SSE subscriptions replaced

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The MCP 2026-07-28 Spec Rewrite: Full Guide

The MCP 2026-07-28 spec rewrites the protocol core: sessions gone, a new required RPC, subscriptions replaced. Full rundown of every breaking change.

Aug 6, 2026Read more →