Unclear What the extra follow-up call actually does or returns is not stated.
What
When the publish tool reports that files were 'copied server side' from another artifact, Claude Code now fetches each source file's slug and then chains a second call using that slug, the environment, an abort signal, and credentials. This is an added step that wasn't there before.
Why
This is an internal change to how artifact copy-sources are resolved after a server-side copy. It isn't described as changing what a user sees, but it adds a network round trip in this path.
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What the extra follow-up call actually does or returns is not stated.