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Adds MCP_2026_07_28 to ProtocolVersions and includes it in the default protocolVersions() lists for the base transport provider, Streamable HTTP server transport provider, stateless server transport, generic transport, and the Streamable HTTP client transport builder, so initialize negotiation can advertise and echo the latest published specification revision. This adds negotiation support only; feature work for the 2026-07-28 revision (Tasks extension, MCP Apps, etc.) remains tracked separately (e.g. SEP-2663 under the 2.2 milestone). Co-Authored-By: Claude Code <noreply@anthropic.com>
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Motivation and Context
The 2026-07-28 protocol version — the latest published MCP specification revision — is missing from the
ProtocolVersionsinterface and from the defaultprotocolVersions()negotiation lists.This follows the same approach as #733, which added the 2025-11-25 version: adding the version so
initializenegotiation can advertise and echo it, without claiming feature parity for the new revision's capabilities. Feature work for the 2026-07-28 revision (e.g. the Tasks extension, SEP-2663) remains tracked separately under the 2.2 milestone.How Has This Been Tested?
./mvnw -pl mcp-core test: 468 tests pass../mvnw -pl mcp-test -am test -Dtest='HttpClientStreamableHttpVersionNegotiationIntegrationTests,McpClientProtocolVersionTests,McpServerProtocolVersionTests': 12 tests pass, including updated wire-level negotiation assertions.usesLatestVersion,usesServerSupportedVersion,clientDoesNotSupportProtocolVersion20241105ByDefault,shouldUseLatestVersionByDefault).mcp-testsuite additionally shows pre-existing failures in testcontainers-based HTTP client tests (Could not find a valid Docker environment) that reproduce identically on cleanmainand are unrelated to this change.Breaking Changes
No
Types of changes
Checklist
🤖 Generated with Claude Code