What probably matters to youSection of the release
What
The sign-in flow behind /design-login (which connects your claude.ai account so /design-sync can read and write design-system projects) has been reworked. It now supports pasting in an authorization code manually even in situations where it previously wasn't offered, since Claude Code can no longer always assume whether a browser can reach the local sign-in listener.
When the login fails, it now returns one of several specific reason codes: interrupted, unconfigured, remote, invalid, save_failed, timed_out, or failed, instead of just a generic message. A new check can also abort the flow partway through, after a login slot is validated.
Why
The more flexible manual-code path means you're less likely to get stuck when Claude Code can't tell whether a browser-based login will work, particularly on remote sessions. The structured failure reasons make it clearer why a login attempt didn't succeed.
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-login, on Claude apps gateway for Amazon Bedrock, Claude Platform on AWS, Google Cloud, and Microsoft Foundry.| [`/design-sync`](/docs/en/commands#all-commands) and `/design-login` | Not available | Both need claude.ai, which the CLI doesn't contact on gateway sessions, so neither command appears there |claude-apps-gatewaysee 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-login, on Claude apps gateway for Amazon Bedrock, Claude Platform on AWS, Google…
