MCP Spec Final Lock Set for July 28; A2A Protocol Crosses 150 Adopting Organizations

Microsoft Agent Framework Blog·medium signal

The Model Context Protocol's 2026-07-28 revision is in release candidate with a final spec lock scheduled for July 28, while the Agent-to-Agent (A2A) protocol has now passed 150 adopting organizations and ships production SDKs in Python, JS, Java, Go, and .NET. For anyone building on MCP, the next two weeks are the window to review breaking changes before the version freezes. The dual-protocol consolidation (MCP for tools, A2A for agent-to-agent) is quietly becoming the assumed interop layer.