Under the hood
Artifacts can now be flagged as 'authored by others' when Claude isn't their sole author
What
Artifacts (files Claude Code produces as a distinct output) can now be marked with an authoredByOthers flag. A related check now treats an artifact as not fully Claude-owned if it has this flag, alongside the existing reasons: probeFailed, cowritten, or typeLocked.
Why
This lets Claude Code correctly track and handle artifacts that weren't entirely created by Claude, presumably affecting how such artifacts can be edited or treated compared to fully Claude-authored ones.