Under the hood
Artifacts no longer route MCP-backed data types through the store's write-through path
What
Artifacts (documents Claude Code can create and update, like code files or data files) can be backed by different storage types. The logic that decides which types get written straight through to the data store previously included MCP-fronted (Model Context Protocol) types alongside plain "data" and "write_db" types. That MCP case has been removed, so only "data" and "write_db" types now use this write-through path.
Why
This narrows which artifact types are treated as directly writable to storage, likely because MCP-backed artifacts need different handling than locally stored ones.