Claude Code Subagents Run in the Background by Default

What it is — Resolved via search — verify before relying on it. Claude Code docs on running subagents concurrently in the background while you keep working in the main session.

Key points

• Claude decides whether a subagent runs in the foreground or background based on the task, or you can ask it to run in the background (or press Ctrl+B).
• Background subagents surface permission prompts in your main session, naming which subagent is asking.
• Disable background tasks entirely with the CLAUDE_CODE_DISABLE_BACKGROUND_TASKS environment variable.