MCP 2026-07-28 spec: which version does Sume's hosted server speak?

Sume's hosted MCP server, https://mcp.sume.com/mcp, negotiates three protocol versions in its code today: 2025-03-26, 2025-06-18 and 2025-11-25, with 2025-11-25 as the default. It does not implement the 2026-07-28 revision, so do not describe it as doing so. Clients connect through the version negotiation they already use.

The 2026-07-28 facts below come from the MCP project's release post, and the client fact from Claude Code's changelog, both read 2026-09-29. The server facts come from Sume's MCP code, which reports server name sume-remote-mcp, version 0.4.0.

What did the 2026-07-28 revision change?

The MCP blog lists the release date as July 28, 2026 and describes these changes.

Which versions does Sume's server accept?

It reads the protocol version the client sends at initialize and answers with a version it supports. Its capabilities are tools with listChanged set to false. There is no Tasks support on the server, so a long clip is not a protocol task: it is a job id you wait on with jobs_wait.

Do clients on the new revision still connect?

Claude Code's changelog says v2.1.284 added MCP URL-mode elicitation on 2026-07-28 protocol connections, so that client can speak the new revision. Whether it falls back to an older one for a given server is client behavior; this site has not tested every client, so check your client's connection status after adding the server.

If a connection fails, the server's mcp_health tool (once connected) and the client's own logs are the first places to look; the failure is usually authentication, not the protocol version.

What should I not assume?

Do not assume Tasks, list caching or the new routing headers are available on the hosted server. Do not assume a client on the new revision changes what tools Sume lists. The tool set, the spend controls and the job model are the same for every client version.