Claude 2.1.280 renders inline by default: no alt screen, no mouse tracking, transcript in real scrollback. The version-only gate still sent every wheel tick and touch swipe as SGR reports, which Claude ignores, so scrolling a Claude session was dead while codex (routed locally) worked. Gate forwarding on the server-recorded cliMouseTracking flag, which fullscreen mode (CLAUDE_CODE_NO_FLICKER=1) sets.