Amazon· Bedrock / Nova

How AgentCore Gateway supports the MCP 2026-07-28 spec

Today, the Model Context Protocol (MCP) published its 2026-07-28 specification, the largest and most significant revision of the protocol since its launch. With this release MCP becomes a stateless protocol that scales on ordinary HTTP infrastructure. Alongside the transport changes, this new version introduces a governed extensions system, strengthens authorization by aligning more closely with enterprise practices for OAuth 2.0 and OpenID Connect, and establishes lifecycle guarantees that limit future breakage. You can start using the latest protocol on your AgentCore Gateway , a capability of Amazon Bedrock AgentCore, today by calling UpdateGateway with the list of versions you want your gateway to support. Existing clients keep working exactly as before, and there is no per-target step. In this post, we walk through what changed in the protocol and why, what it means for your agents and tools, and how to enable the new version on your gateways. Already familiar with the spec changes? Jump straight to Updating your AgentCore Gateway . What changes with the new spec and why it matters This release contains backward-incompatible changes to the MCP protocol. …

Announced

28 Jul 2026 19:07 UTC