Update (November 11, 2025): The specification release candidate (RC) date has been shifted from November 11th to November 14th, 2025 . The specification release date remains to be November 25th, 2025 . Release Timeline The next version of the Model Context Protocol specification will be released on November 25th, 2025 , with a release candidate (RC) available on November 11th, 2025 . We’re building in a 14-day RC validation window so client implementors and SDK maintainers can thoroughly test the protocol changes. This approach gives us the focused time we need to deliver critical improvements