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Published by Model Context Protocol Blog (T1 source). The original is at https://blog.modelcontextprotocol.io/posts/2026-07-28/.

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The MCP blog announces the 2026-07-28 specification, introducing a stateless protocol core, multi round-trip requests, header-based routing, cacheable list results, authorization hardening, a formal extensions framework, and updated Tier 1 SDKs.

Official spec release from the MCP project itself — the protocol layer most agent tool setups are built on, so protocol-level changes propagate across implementations.

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