The Model Context Protocol has published its 2026-07-28 specification. According to the official announcement, this release marks the largest revision to the protocol since its initial launch. The publication details several key architectural modifications and functional enhancements.
Key technical changes in the 2026-07-28 specification include making the protocol stateless. The updated protocol also incorporates a governed extensions system. Additionally, the revised specification introduces hardened authorization mechanisms.
Administrators can implement the updated protocol specification on supported cloud infrastructure. The new version can be enabled directly on Amazon Bedrock AgentCore Gateway. Enabling this updated release requires only a single UpdateGateway call.

