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MCP & Skills StandardizationModel Context ProtocolMCP (Model Context Protocol)

Model Context Protocol revises its specification

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Specification revision — removes protocol-level sessions and Mcp-Session-Id, drops the initialize handshake, makes server/discover mandatory, has the MRTR pattern replace server-initiated requests, announces the end of support for Roots, Sampling, Logging and OAuth DCR, and introduces a 12-month deprecation grace policy

Why it matters

MCP is redesigned from the ground up, from a protocol of stateful sessions into a stateless, per-request one. The largest break in backward compatibility yet

Source — Primary sources first; secondary reports are labelled “Press”

Officialmodelcontextprotocol.iohttps://modelcontextprotocol.io/specification/2026-07-28/changelog

Added in Week 35, 2026 · See that week

On the map — ④ MCP line

  1. Previous stopMCP Dev Summit North America 2026 (New York, 1,200 attendees)
  2. This recordModel Context Protocol
  3. Next stopAnthropic releases Model Hardware Standard (MHS) as a research preview
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Nearby on the same axis

MCP publishes specification version 2026-07-28OfficialGoogle's A2A protocol moves to the Linux Foundation's Agentic AI FoundationPressAnthropic releases Model Hardware Standard (MHS) as a research previewOfficialRASO (Retrieval-Augmented Skill Optimization via Cross-Harness Adaptation)Paper