Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
ArtifactsArea: what it touches
Internal ChangesKind: in v2.1.280,
Internal ChangesSection of the release
What
The system prompt used when Claude builds Artifacts (self-contained pages Claude can generate and preview) gained two new sections:
'## Where a page keeps its state' explains the choice between browser storage, the artifact capability, and the db capability for storing a page's data.
'## Verify before you hand over the link' requires Claude to do one functional pass, previewing the page and checking any db/list and endpoint behavior, before handing over an Artifact that declares capabilities.
Why
This gives Claude clearer rules for choosing where an Artifact stores its data, and requires an actual check that the page works before it's handed to the user, catching broken Artifacts before the user sees them.
