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","side","line","Comments in the same thread:\n\n**_{_{![P1 Badge](https://img.shields.io/badge/P1-orange?style=flat)}} Respect negotiated MCP version for 2025-06-18 clients**\n\nWhen the MCP SDK is missing, `_PROTOCOL_VERSION` now defaults to `2025-11-25`, yet the HTTP transport still accepts `2025-06-18` (see `_validate_protocol_version`). An older client that sends `initialize` with protocolVersion/header `2025-06-18` will now get an initialize response advertising `2025-11-25` because `_handle_initialize` always returns `_PROTOCOL_VERSION`, so strict clients will reject the handshake as a version mismatch despite being explicitly allowed. The server should either echo the client’s requested version when supported or fail negotiation instead of unilaterally upgrading.\n\nUseful? 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