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MCP Adapter 0.7.0 for WordPress refuses a request that follows initialize without the MCP-Protocol-Version header: 'Invalid Request: MCP-Protocol-Version header is required for a 2025-06-18 session'. The contract probe never sent it, so the CLI test of web-app-wordpress failed at tools/list. The probe now keeps the version the server answers initialize with and sends it on every later request of the streamable HTTP transport, which the specification asks of a client since 2025-06-18. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>