Protocol sessions go away, but apps can stay stateful with MRTR
dfinke · x · 2026-07-22
The post clarifies an important protocol nuance: removing the protocol-level session does not force applications to be stateless.
Instead, the change is at the transport layer. Servers can still ask for things mid-call through a new MRTR (Multi Round-Trip Request) pattern, rather than keeping an SSE stream open. The post also notes that Roots, Sampling, and Logging are moving into formal deprecation with a 12-month minimum window, so nothing breaks immediately.
Related event: MCP Protocol's Largest Update Finalizes on July 28: Shifts to Stateless(8 posts)→
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