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7/23/2026
The original title is: "MCP spec update: stateless sessions, deprecated features, and migration guide"

The original title is: "MCP spec update: stateless sessions, deprecated features, and migration guide"

Original: MCP Just Killed the Handshake (Your Server Is Next)

Short summary

The MCP specification finalizes on July 28, dropping the initialize handshake and Mcp-Session-Id header to make servers stateless and horizontally scalable. Deprecated features include Roots, Sampling, and Logging, each with named replacements and a 12-month runway. OAuth 2.1 becomes mandatory, and a new mcp-spec-audit tool helps scan repos for migration issues.

  • •MCP drops initialize handshake and session IDs for stateless architecture
  • •Roots, Sampling, and Logging deprecated with 12-month migration window
  • •OAuth 2.1 now mandatory; mcp-spec-audit tool released for migration scanning

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