- Sources: primary, coverage, discussion
- Summary: The initialize handshake and the
Mcp-Session-Id header leave the core request path. Elicitation becomes Multi Round-Trip Requests as a breaking change, and new Mcp-Method and Mcp-Name headers let gateways route without parsing JSON. Roots, Sampling, Logging, Dynamic Client Registration and the legacy HTTP+SSE transport are deprecated under a new 12-month minimum removal window. - Why it matters: Servers can run on request-scoped infrastructure instead of holding per-client state, at the cost of a breaking change to elicitation.
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