Claude Code Subagents Can Now Spawn Subagents

In Claude Code, a subagent can spawn its own subagents. This landed in v2.1.172.

To see why that matters, you have to look at what wasn't possible before. I maintain uc-taskmanager — a Claude Code pipeline that automates requirement → specification → plan → implementation → verification → commit across six agents. Its README stated this constraint twice:

"Subagents can't nest. So Main Claude orchestrates everything."

That premise is gone. So I moved the orchestrator out of Main Claude and into an agent.