The 2026-07-28 Specification
Summary
The MCP 2026-07-28 specification introduces a stateless core, MRTR, header-based routing, and cacheable responses, with expanded extensions like EMA and CIMD. It includes security hardening updates and a formal deprecation plan, alongside updated Tier 1 SDKs (TypeScript, Python, Go, C#) and ecosystem support. The post emphasizes scalable, stateless agent infrastructure and plan upgrades.