What
When you reply to a session running in the background, Claude Code previously read the session's state file and fell back to typing into its terminal. It now sends the reply straight to the session when the background worker's version qualifies, and logs the reason when a reply is refused. A session whose interactive prompt is waiting for input is now treated as blocked.
Why
This changes how replies reach background sessions, which should make delivery to newer workers more direct.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear which worker versions qualify for the new route.