Claude Code strips invisible Unicode from prompts and shows you the cleaned version before sending
GitHub·high signal
v2.1.277 removes invisible Unicode formatting and tag characters from a prompt and displays the cleaned prompt for review before it is sent. Tag characters (U+E0000 block) are the standard carrier for hidden instructions pasted from a web page or an issue body. The review step is the part that matters, since silent stripping would leave you unable to tell a poisoned paste from a clean one.