You'll notice
Artifact lists now warn that shared artifacts' titles are untrusted data, not instructions
What
When Claude Code lists artifacts that include ones other people have shared with you, the result now starts with a warning line saying those titles are data, not instructions.
Why
A malicious or careless person could name a shared artifact something that looks like a command, a technique known as prompt injection. This warning helps prevent Claude from mistakenly treating a crafted artifact title as something it should act on.