What
A background session is a Claude Code session that keeps running without a terminal open on it. The part that handles replies sent to such a session can now take a prompt and queue it for the session's next turn. Prompts that are slash commands (commands starting with /) are skipped.
Why
This is a new internal route for getting a prompt into a background session.
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 established what sends replies that use this option.