Skills
Claude Code Agent Teams: Parallel Orchestrator-Worker Development with Built-in Mailbox Coordination
Agent Teams (introduced February 2026) allow one Claude Code session to act as team lead, assigning tasks to parallel teammate sessions that share findings and challenge each other via a built-in async mailbox system — a fundamentally different model than subagents. The consistent production finding is that 2-agent teams with narrow scope outperform larger teams with broad scope; plan-approval gates before any agent writes code are required to prevent divergence. The Anthropic Engineering team validated the pattern by building a 100,000-line Rust C compiler across ~2,000 parallel Claude sessions.
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