Unclear It is not clear what supplies the custom message, so whether users will ever see different wording is unknown.
What
The action that stops a background agent (a helper that keeps working while you do other things) previously always printed "Session stopped.". It can now take an optional message, which is printed instead. The notice for a stopped task, which ends with "was stopped by the user.", can now also have a note added after that text.
Why
This gives Claude Code a way to explain why a stop happened instead of always printing the same fixed text.
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 what supplies the custom message, so whether users will ever see different wording is unknown.