Computer use now rejects invalid key combinations with a clear error

With computer use, Claude can press keys on your computer. A key chord is a combination pressed together, such as Ctrl+C. Claude Code now checks chords before sending them and refuses:

• Chords with more than the allowed number of keys.
• Chords with more than one key that is not a modifier key (such as Ctrl, Alt or Shift). Shift together with an arrow, Home, End or Page key is still allowed.

The error tells Claude that a chord is modifier keys plus at most one other key, and to send a separate action for each key.