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Claude Code 2.1.292 switches stdio MCP servers to a new protocol, docs still say opt-in

Claude Code 2.1.292 changes how it connects to local (stdio) MCP servers, negotiating protocol version 2026-07-28 by default on every install, including Bedrock, Vertex and Foundry, with MCP_PROTOCOL_NEGOTIATION=legacy as an opt-out. However, the documentation still describes the older opt-in behaviour.

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Source published2026-10-07T12:46:24+00:00

Published here2026-10-07T13:21:51+00:00

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Claude Code 2.1.292 switches stdio MCP servers to a new protocol, docs still say opt-in

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