What
New env var for Windows users on keyboards with an AltGr key. AltGr is used on many European and international layouts to produce characters like @, €, [, ], etc. — but it's also interpreted as Ctrl+Alt in Windows, which can interfere with Claude Code shortcuts.
Usage
# Force AltGr combinations to always be treated as text (recommended for most EU users)
CLAUDE_CODE_ALTGR_AS_TEXT=true claude
# Disable AltGr text mode entirely
CLAUDE_CODE_ALTGR_AS_TEXT=false claude
# Auto-detect (default): enabled if WT_SESSION is set (Windows Terminal)Details
true/1forces "force" mode — AltGr combos always produce textfalse/0forces "off" mode — AltGr combos pass through as Ctrl+Alt key events- Omitted: "auto" mode, enabled when
WT_SESSIONis present (Windows Terminal) - Only applies to printable character ranges (codepoints 32–126 and 160–55295)
Evidence
New env var handler (search for "CLAUDE_CODE_ALTGR_AS_TEXT")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.