Model Context Protocol 2026-07-28 Specification Released

The Model Context Protocol (MCP) has released its 2026-07-28 specification, which introduces a stateless design, a governed extensions system, and hardened authorization.

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Source · Jul 28, 2026, 7:07 PM · On Illumora · Jul 28, 2026, 7:12 PM

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Read the source →AWS Machine Learning Blog — How AgentCore Gateway supports the MCP 2026-07-28 spec | Amazon Web Services

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The Model Context Protocol (MCP) has published its 2026-07-28 specification. This release represents the largest revision to the protocol since its initial launch.

Key Points

The Model Context Protocol (MCP) 2026-07-28 specification is the largest revision since its launch.
The MCP is now stateless.
A governed extensions system has been introduced.
Authorization has been hardened.
The new version can be enabled on Amazon Bedrock AgentCore Gateway.
Enabling the new version requires a single UpdateGateway call.

Context

According to the AWS Machine Learning Blog, the Model Context Protocol (MCP) has undergone significant changes with its 2026-07-28 specification. These updates aim to enhance the protocol's architecture and security.

Why It Matters

Builders using Amazon Bedrock AgentCore Gateway can adopt the updated MCP specification to leverage its new stateless design, governed extensions, and improved authorization, potentially impacting system design and security practices.

What To Do

Review the Model Context Protocol (MCP) 2026-07-28 specification for detailed changes.
Note the stateless nature of the updated protocol.
Investigate the new governed extensions system.
Prepare to enable the new version on Amazon Bedrock AgentCore Gateway using an UpdateGateway call.