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Publishing an artifact can now copy files across organizations, when the server supports it
What
When publishing an artifact involves copying files from another artifact, Claude Code can now pass a cross_org_ok flag to the upload service to allow that copy to cross organization boundaries. A new telemetry reason, copy_predates_cross_org, distinguishes servers that don't yet support cross-organization copying from other kinds of copy failures, and there's a dedicated refusal message shown when a server doesn't support it.
Why
This is a server-gated capability, so whether it actually works depends on the server the artifact is published to; the distinct error reason helps tell an unsupported server apart from a genuine copy failure.