Summary
The 2026-07-28 MCP specification is out (announcement). mcpd should adopt it by bumping mark3labs/mcp-go once that library ships 2026-07-28 support, rather than porting protocol handling by hand.
Current state
go.mod pins github.com/mark3labs/mcp-go v0.55.1, whose LATEST_PROTOCOL_VERSION is 2025-11-25.- mcpd negotiates the protocol version through the library:
internal/daemon/daemon.go:375 passes mcp.LATEST_PROTOCOL_VERSION into Initialize. A dependency bump therefore carries the new version through automatically — no call-site changes required for the version itself.
- mcpd talks to servers over STDIO only and exposes its own REST API upstream, so the spec's HTTP-transport changes (stateless core, header routing, SSE deprecation) do not require code changes here.
Notes
- No urgency: version negotiation is backward-compatible, so a 2026-07-28 server negotiates down to
2025-11-25 against the current build. Nothing is broken today.
- mcpd uses the community
mark3labs/mcp-go, not the official modelcontextprotocol/go-sdk. The 2026-07-28 SDK announcement refers to the official SDK; this issue tracks mark3labs/mcp-go specifically. If that library does not add 2026-07-28 support, evaluating a move to the official SDK is a separate, larger decision and out of scope here.
Done when
mark3labs/mcp-go is bumped to a release that supports the 2026-07-28 protocol version.make test and make lint pass against the bumped dependency.NOTICE regenerated if the dependency set changed.
Summary
The 2026-07-28 MCP specification is out (announcement). mcpd should adopt it by bumping
mark3labs/mcp-goonce that library ships 2026-07-28 support, rather than porting protocol handling by hand.Current state
go.modpinsgithub.com/mark3labs/mcp-go v0.55.1, whoseLATEST_PROTOCOL_VERSIONis2025-11-25.internal/daemon/daemon.go:375passesmcp.LATEST_PROTOCOL_VERSIONintoInitialize. A dependency bump therefore carries the new version through automatically — no call-site changes required for the version itself.Notes
2025-11-25against the current build. Nothing is broken today.mark3labs/mcp-go, not the officialmodelcontextprotocol/go-sdk. The 2026-07-28 SDK announcement refers to the official SDK; this issue tracksmark3labs/mcp-gospecifically. If that library does not add 2026-07-28 support, evaluating a move to the official SDK is a separate, larger decision and out of scope here.Done when
mark3labs/mcp-gois bumped to a release that supports the 2026-07-28 protocol version.make testandmake lintpass against the bumped dependency.NOTICEregenerated if the dependency set changed.