IDE integration opens 3 empty Cursor windows on startup (Linux AppImage)

Description

When running claude from Cursor's integrated terminal (Linux, AppImage install), Claude Code opens 3 new empty Cursor windows (no project) before giving up. The Claude Code VS Code extension is installed in Cursor.

Environment

• OS: Linux (Ubuntu, kernel 6.8.0)
• Cursor: v2.4.31, installed as AppImage
• Claude Code extension: installed via Cursor marketplace ("Claude Code for VS Code")

Relevant env vars in Cursor's terminal

• TERM_PROGRAM=vscode (not cursor)
• CURSOR_TRACE_ID is set
• APPIMAGE=/home/.../Cursor.AppImage
• Cursor binary runs from temp mount: /tmp/.mount_CursorXXXXXX/

Expected behavior

Claude Code connects to the running Cursor instance via the installed extension.

Actual behavior

Claude Code opens 3 new empty Cursor windows (without any project), fails to connect, then starts without IDE integration.

Workaround

claude config set ideIntegration false