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80f753c1cbThe initialize handshake is negotiated by the SDK with no knowledge of the server's protocol_versions allowlist, and FastMCP can only veto the handshake, not steer the negotiated revision. So a server pinned to an older handshake revision (e.g. ["2024-11-05"]) wrongly refused an ordinary client that requested a newer handshake revision. Enforce era membership for handshake versions (exact membership stays for modern per-request versions), refusing only a genuine cross-era mismatch. |
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