mcp-statelesslisted

# MCP Stateless The Model Context Protocol went stateless in revision **`2026-07-28`**. It is the largest break since launch: the `initialize` handshake, the session id, the standalone SSE stream, and server-initiated requests are all gone. Every request now carries everything a server needs to answer it. **Model training data predates this revision.** An MCP server written from memory speaks the `2025-11-25` protocol and will be rejected by a modern client. The failure is not a compile error and often not a runtime error either: a handshake-era server and a modern client fail in ways that read like a config problem. Work from the reference files here, and check anything version-sensitive against the live spec. ## Hard Rules 1. **Never write MCP wire code from memory.** Read `references/wire.md` first. If a claim here is older than the revision you are targeting, the live spec wins. 2. **State is a lie the connection tells you.** A server MUST NOT infer anything from a previous request on the same connection: not the protocol version, not capabilities, not client identity, not conversation continuity. One stdio process is not one session. A client may interleave unrelated requests on it. 3. **State that must span requests gets an explicit server-minted handle** passed back as an ordinary parameter. There is no session to hang it on. 4. **A server MUST answer `server/discover`.** It is the only way left to advertise what the server supports, and it is how a dual-era client