MCP Protocol Version Negotiation: Why Your Server Answers the Wrong Era
This story is from 2026-10-12. It is preserved in the archive; the latest stories are on the live feed.
MCP Protocol Version Negotiation: Why Your Server Answers the Wrong Era The direct answer, up front: when your MCP client asks for protocol version 2026-07-28 and the server answers 2025-11-25, that is usually not a bug — it is the spec's downward negotiation. The real red flags are echo machines t…
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- 2026-10-12 13:34 · DEV Community — AI
MCP Protocol Version Negotiation: Why Your Server Answers the Wrong Era