# Model Context Protocol: 2026-07-28 specification revision released as stable

Date: 2026-07-28

The `2026-07-28` revision of the Model Context Protocol specification was published as a stable release on 2026-07-28, following a release candidate on 2026-05-29. The release note points to the specification at modelcontextprotocol.io and to the revision's changelog for the list of changes. Sources: [2026-07-28 release](https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2026-07-28), [changelog](https://modelcontextprotocol.io/specification/2026-07-28/changelog).

Relation to the directory: this is the latest tagged release of the spec repository as of 2026-09-30. SDK and framework support for a given revision varies; each tool page's MCP cell links to that tool's own evidence. See [MCP](/tools/mcp), [A2A vs MCP](/compare/a2a-vs-mcp) and the [protocol matrix](/protocols).

Official source: https://github.com/modelcontextprotocol/modelcontextprotocol/releases/tag/2026-07-28

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Data as of 2026-07-28. Not affiliated with listed projects. HTML version: https://multiagentguide.top/new/mcp-spec-2026-07-28