Developer corrects MCP migration tool that confidently gave wrong upgrade advice

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A developer building a compliance checker for the Model Context Protocol's major 2026-07-28 breaking changes discovered their own tool was giving incorrect migration guidance. The checker's rule MCP007 advised users to upgrade to @modelcontextprotocol/sdk version 2.x, a package that does not exist and never will, stopping at version 1.30.0. The MCP v2 release actually ships under entirely new package names, including @modelcontextprotocol/server, @modelcontextprotocol/client, and @modelcontextprotocol/core, among others. The developer corrected the rule to detect the presence of the old v1 package rather than comparing version numbers, and added automated tests to prevent the same mistake from recurring. The 2026-07-28 MCP revision removes stateful sessions, replaces server-initiated requests with multi-round-trip requests, and makes server discovery mandatory.

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