MCP server supports protocol revision 2026-07-28
Released: August 13, 2026
MCP server Changed
Section titled “MCP server ”The remote MCP endpoint (POST /mcp) now speaks MCP protocol
revision 2026-07-28 in addition to the 2025-era revisions it already
served. A client that negotiates the newer revision — its handshake uses
server/discover and a per-request _meta envelope instead of the
2025 initialize handshake — now connects successfully instead of being
rejected with Unsupported protocol version.
Nothing about the tools, authentication, rate limiting, or error envelopes changed. All 24 tools behave exactly as before, and clients speaking the 2025-era revisions keep working unchanged — a single endpoint serves both eras and picks the right one per connection.
No action is required. If your MCP client recently started negotiating
2026-07-28 and saw connection failures, they are resolved.