What
- When a
claude.aicredential 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 specificdesign_needs_authorizationerror (providerclaude_design) instead of a genericdesign_tool_auth_failederror.
Why
This lets the interface recognize design-specific authentication problems and send users straight to /design login instead of showing a generic failure message.
Names in the bundle/design
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.
Added since
A small documentation edit on Commands touched a line naming /design after this was published.
| `/design [brief]` | **[Skill](/docs/en/skills#bundled-skills).** Draft UI mockups, screen flows, landing pages, or posters as artboards on one canvas, published as a Claude Design [artifact](/docs/en/artifacts#draft-a-design-canvas), for…commands see the edit
Confirmed since
Anthropic'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-links see the edit
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agrees
Anthropic's documentation has since written up /design, on Open external links from MCP Apps.