You'll notice
Publishing an artifact now blocks copying files from another organization's artifact unless ownership is confirmed
What
When publishing an artifact that copies files from another artifact via a files map, Claude Code now checks whether the source artifact belongs to a different organization. If it does and that ownership can't be confirmed, the whole publish is rejected with a new error. Separately, publishing is now explicitly denied outright when the destination artifact itself belongs to a different organization.
Why
This closes off a way that content could be copied across organization boundaries without proper ownership checks, protecting artifacts from being published into or sourced from an organization that shouldn't have access to them.