Claude Code v2.1.257 · 1 Sep 2026
Artifact types can now declare a 'used by other Artifacts' relationship, e.g. design systems
Artifact types can be reused as sub-types such as design systems, applied via the list action with a type or type_url.
Use it now Tier: how much it should matter to you
4 Useful: my rating, 1 to 5
3 Signal: worth watching, 1 to 5
Artifacts Area: what it touches
Improvements Kind: in v2.1.257, 01 Sep 26
What probably matters to you Section of the release
The Artifact-type discovery prompt now documents how to list and apply reusable sub-types, such as design systems, to a new Artifact via action :"list "type type_url. It defaults to the org's default type without asking, or asks the user when several such types exist and none is marked default.
Read from
Names in the bundle action: "list" type_url
See this entry in the whole of v2.1.257 →
1 Sep 2026 · 505 entries, this one is #105.
45 231 71 158
Open the release →
Names in this entry
setting action Claude can watch artifact comment threads and post replies or edits, off unless you set the env var.
setting list Mid-session system messages now work with more models, and two doc references were corrected.
setting type MCP servers rejected from --mcp-config are now listed on stderr and in the init message instead of vanishing.
Is this right?
0 0 Feedback
What's wrong with this entry?
Hard to understand Too vague Looks wrong Not relevant to me Too long Missing the detail I wanted Duplicate of another card
Clear Learned something new I can act on this Good catch
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.
← Previous · 104 of 505
Remote session attach now checks whether directory sync exists elsewhere before adopting…
Under the hood Directory Sync
In v2.1.257 What probably matters to you release-page order
Next → · 106 of 505
Comments/artifact tool converted from macOS-app allowlist to full addon tool
Use it now Artifacts
