What probably matters to youSection of the release
What
The SDK is the kit for building programs on top of Claude Code. Such a program can supply a getOAuthToken callback that hands Claude Code a sign-in token.
When the program asks for a token, Claude Code now passes the callback a tokenState value as well as the kind of token. It does so only when that value is refused or not_refused.
Why
The callback can now tell whether the previous token was refused, which can shape how it gets a fresh one.
