Model Context Protocol publishes its 2026-07-28 specification, removing protocol-level sessions

On July 28, 2026 the Model Context Protocol project published the stable release of the 2026-07-28 revision of the MCP specification, which follows the 2025-11-25 revision. The changelog lists removing protocol-level sessions and the Mcp-Session-Id header from the Streamable HTTP transport, and removing the initialize handshake so that every request carries its protocol version and client capabilities in _meta. It also adds a required server/discover method and a Multi Round-Trip Requests pattern, and moves tasks into an official io.modelcontextprotocol/tasks extension. The revision deprecates the Roots, Sampling, and Logging features and adopts a feature lifecycle and deprecation policy with a minimum twelve-month deprecation window. USASI has not tested implementations of this revision.12

USASI. (2026, October 13). Model Context Protocol publishes its 2026-07-28 specification, removing protocol-level sessions. United States of America Superintelligence. https://unitedstatesofamericasuperintelligence.com/news/mcp-specification-2026-07-28-released/

@misc{usasi_news_mcp_specification_2026_07_28_released,
  author = {{USASI}},
  title = {Model Context Protocol publishes its 2026-07-28 specification, removing protocol-level sessions},
  year = {2026},
  month = oct,
  howpublished = {\url{https://unitedstatesofamericasuperintelligence.com/news/mcp-specification-2026-07-28-released/}},
  note = {United States of America Superintelligence. Last updated 2026-10-13}
}