Claude Code Shifts to Background Subagents by Default, Boosting Autonomous Dev Workflows

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Anthropic's Claude Code tool has quietly updated its behavior so that subagents now run in the background by default, a change that took effect around July 1. Previously, the main conversation would pause and wait whenever a subagent was handling a delegated task; it now continues working in parallel and notifies the user upon completion. The update also raises the concurrent subagent cap to 20 and allows nesting up to three levels deep, enabling complex multi-task sessions to run simultaneously rather than sequentially. Alongside this, Claude Sonnet 5 became the default model in late June and Claude Opus 5 followed on July 24, both featuring a 1 million-token context window that supports longer uninterrupted sessions. A separate August fix addressed a security issue where subagents in worktree-isolated sessions could inadvertently execute destructive git commands against the main repository checkout.

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