The second part of the context engineering series. Part 1 covered the foundations: what an LLM is, how it becomes an agent, and the seven layers of configuration (CLAUDE.md, hooks, MCP, skills, plugins) that make it production-ready. This part picks up where we left off — with subagents, agent teams, worktree isolation, and the context management machinery that keeps it all running as sessions scale. We close with a look at how the broader open-source ecosystem is converging on the same orchestration patterns from different directions.