You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
ArtifactsArea: what it touches
ImprovementsKind: in v2.1.280,
ImprovementsSection of the release
What
When a claude.ai credential lacks access to Claude Design, the resulting error now carries a structured tag {kind: "auth_missing_scope", provider: "claude_design"} instead of just a name, for more consistent error handling.
When the design tool's credential check fails because the user needs to log in (needs_design_login), the client now throws a specific design_needs_authorization error (provider claude_design) instead of a generic design_tool_auth_failed error.
Why
This lets the interface recognize design-specific authentication problems and send users straight to /design login instead of showing a generic failure message.
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Confirmed sinceAnthropic's documentation has since written up /design, on Open external links from MCP Apps.* [Design guidelines](/docs/connectors/building/mcp-apps/design-guidelines#interaction-patterns): which interactions belong in your app and which belong in chatconnectors/building/mcp-apps/external-linkssee the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up /design, on Open external links from MCP Apps.
