What
When a session is backgrounded or exits, Claude Code can hand its unfinished work over to another session. This handoff is on by default, and setting the CLAUDE_DISABLE_ADOPT environment variable turns it off.
The variable is now checked in more places. Handoff when a session exits in the background is one of them. Checks on agents, which are helpers Claude runs to do part of a task, are another, along with checks on whether a frame is still live and one further check.
Why
If you set CLAUDE_DISABLE_ADOPT to stop work being handed from one session to another, it now reaches further into Claude Code. It remains on by default when the variable is not set.
Names in the bundleCLAUDE_DISABLE_ADOPT
Documented inclaude-code/agent-view
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 the handoff does for a user in each of the newly covered places.