When working with first-party artifact types ("design", "migrated-design", and "slides"), Claude Code now automatically fetches and inlines type-specific reference documents, such as format.md, fonts.md, craft.md, and design-system-components.md. This respects PreToolUse hooks (custom scripts that can block a tool call before it runs) and permission rules, re-reading files itself when a hook or rule governs them. Outcomes are reported through a new artifact_init_bundle telemetry event, counting how many reference docs were referenced, left unread, or failed to fetch.
This gives Claude relevant guidance documents automatically when working on design or slides artifacts, without needing them to be fetched manually each time, while still honoring any hooks or permission rules that control file access.