AI
How do I refactor three services at once with subagents?
A captured `claude --print --output-format stream-json` session against the same demo app. Lead agent designs and tests a shared logger sequentially, then dispatches three subagent migrations in a single assistant turn so they run in parallel. The article shows the actual fan-out, the actual subagent prompts (with enumerated call sites), and the moment the lead made a real judgment call on one service's quirks.