Under the hood
Publishing an artifact now records whether copied source files still match what was approved
What
When publishing an artifact, Claude Code's publish tool can include "copies" — files copied into the artifact from another source. On resuming a publish, it now compares a hash of each copy's path, slug, path, and version against what was originally approved. The result, a true/false value, is attached to the artifact_publish_resume telemetry event as copies_carried.
Why
This lets Anthropic detect when copied source files have changed or gone missing between when a publish was approved and when it actually resumes, which matters for keeping published artifacts consistent with what a user agreed to.