Unclear What, if anything, this changes that a user can see is not stated.
What
A subagent is a separate helper Claude starts to handle part of a task. When one starts, Claude Code can now attach several observers to it instead of a single one. It also waits for a step that can be cancelled before setting up the tools the subagent may use.
Why
This reworks, behind the scenes, how subagents are watched as they start.
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What, if anything, this changes that a user can see is not stated.