Steps to reproduce:
Open Xcode 26.3 → Settings → Intelligence → Claude sign-in Click the sign-in button — spinner begins, never completes An email the arrives with a magic link.
The magic link opened a browser page which displayed a 6-digit verification code with instructions reading "enter this verification code where you first tried to sign in" — i.e. back in Xcode. However, Xcode was showing only an endless spinner with no code entry field anywhere in the UI. This is the core bug.
I did since manage to complete authentication sign-in through a second browser verification field that eventually appeared after about 10 minutes and did get signed in, but the Claude Intelligence agent still returns "Your request could not be completed" even after successful sign-in and a full Xcode restart.
Prior to this bug starting at 10 am on February 19 I had been using the intelligence agent successfully for about a week. Anthropic did have some sort of event on their system around February 18/19 so maybe this has been a result of that.
I have notified Anthropic support and Apple Feedback Assistant.
Does anybody have a workaround until either anthropic or Apple get back to me?