Under the hood
Fetching a design-system README for Artifacts now treats a plain 404 as 'file not present' instead of a fetch failure, in one new mode
What
When Claude Code fetches a design-system guide README for use with Artifacts, it can now distinguish between a real fetch failure and a 404 response that carries no specific error code. When a new parameter is set and the response is such a plain 404, Claude Code now silently treats the document as simply absent, rather than reporting it as 'could not be fetched'. The function also now returns a failed field alongside the existing why field.
Why
This avoids surfacing a misleading failure message for what is really just a missing optional file, in the cases where that distinction applies.