MCP Model Input: Sampling Migration and Stateless MRTR
MCP 2026-07-28 deprecates Sampling for new designs and removes the server-to-client request channel. If an existing workflow still needs the client's model, the server returns an `input_required` result and the client retries the original request with the model output. The reasoning loop becomes explicit, bounded, and stateless at the protocol layer.
Visual edition planned
This lesson isn’t interactive yet.
It is part of the curriculum and will get the same treatment as Phase 1 — a visual cover, hands-on labs, derivations with numeric checks and a quiz. Until then, the original lesson is the best place to read it:
Part of Phase 13 — Tools & Protocols. Use the previous / next cards below to keep browsing the phase.