Model Context Protocol

This release marks the stable release of the 2026-07-28 revision of the Model Context Protocol.

The specification is available on the official Model Context Protocol website.

For a detailed overview of changes, see 2026-07-28 changelog.

This release marks the release candidate (RC) 2026-07-28 revision of the Model Context Protocol.

The specification is available in draft form.

For a detailed overview of changes, see 2026-07-28 draft changelog.

[!NOTE] To users and implementers: this specification is not final. Changes may be introduced between the RC and the final release. SDKs will adopt this version at their own pace, and the prior version of the spec may remain in use for an undetermined amount of time.

Refer to the Version Negotiation documentation to learn about the process for clients and servers to determine the version of the protocol being used.

This release marks the stable release of the 2025-11-25 revision of the Model Context Protocol.

The specification is available on the official Model Context Protocol website.

For a detailed overview of changes, see 2025-11-25 changelog.

This release marks the release candidate (RC) 2025-11-25 revision of the Model Context Protocol.

The specification is available in draft form.

For a detailed overview of changes, see 2025-11-25 draft changelog.

[!NOTE] To users and implementers: this specification is not final. Changes may be introduced between the RC and the final release. SDKs will adopt this version at their own pace, and the prior version of the spec may remain in use for an undetermined amount of time.

Refer to the Version Negotiation documentation to learn about the process for clients and servers to determine the version of the protocol being used.

This release marks the initial 2025-06-18 revision of the Model Context Protocol.

For a detailed overview of changes, see 2025-06-18 changelog.

To users and implementors: note that SDKs will adopt this version at their own pace, and the prior version of the spec may remain in use for an undetermined amount of time. The spec describes how clients and servers perform version negotiation with one another, permitting backwards and forwards compatibility.

This release marks the initial 2025-03-26 revision of the Model Context Protocol.

To users and implementors: note that SDKs will adopt this version at their own pace, and the prior version of the spec may remain in use for an undetermined amount of time. The spec describes how clients and servers perform version negotiation with one another, permitting backwards and forwards compatibility.

This release marks the final 2024-11-05 revision of the Model Context Protocol, including all backwards compatible changes made since the initial 2024-11-05 release.

This release marks the initial 2024-11-05 revision of the Model Context Protocol.

Final update to version 2024-10-07 of the spec.