What
A subagent is a helper Claude starts to work on part of a task. When a subagent is stopped, killed or fails, Claude Code now removes the items still waiting on its behalf and gives a reason, either that the subagent was killed or that it was stopped. Before, the items were removed without any reason.
Why
This could matter for permission prompts left hanging after the subagent they belonged to is gone.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
What Claude Code does with the reason it records is not established.