Software1 hOctober 14, 2026, 19:00

MCP gets stateless core in biggest spec overhaul

Anthropic released the 2026-07-28 revision of the Model Context Protocol: the protocol is now stateless, with the initialize/initialized handshake and Mcp-Session-Id header removed. The TypeScript and Python SDKs have each passed a billion downloads, with roughly 500 million monthly downloads overall.

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MCP gets stateless core in biggest spec overhaul

The 2026-07-28 revision removed the initialize/initialized handshake and Mcp-Session-Id header
Each request carries protocol version, client identity and capabilities in _meta
An optional server/discover call lets clients learn server capabilities upfront
TypeScript and Python SDKs each passed one billion downloads

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