You'll notice
Useful2 Signal2
Failed file subscriptions now include the server's own explanation alongside the reason code.
What's wrong with this entry?
Anonymous. No account, no email.
What
When Claude cannot subscribe to or watch a file for updates, the message it sees now includes the server's own explanation and detail alongside the reason code, and the "no subscription" note prints the reason in parentheses next to the URL. Publishing and reading still work in that state.
Evidence
could not register one; publishing and reading still work.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.