Today I got a prompt within Xcode to update the Claude Agent. Prior version was 2.1.59 "2 months ago", and the new version is 2.1.81 "3 weeks ago", but the release notes for the claude binary show what looks like a fix for this issue at 2.1.84 "2 weeks ago". Hope somebody can cut a new release including the keychain fix without having to wait another few months. The 3rd-party tool update system works great, please use it more often! https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md#2184

I encountered the same thing with my beta 2 / iPhone 15 Pro environment, and have also tried deallocating, allocating, triggering uninstalls, forcing download/install etc in various combinations with my en-US locale, not able to get anything other than the error message described above. This same code was working yesterday on beta 1.