Three stages, in order

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Reference

Free, forever. Beginner to expert.How the stages work

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Agent SkillsWritten know-how your agent follows, step by step, whenever a task needs it.
SubagentsFocused helpers with their own workspace, so your main conversation stays clean.
MCP ServersConnectors that let your agent reach tools and data it can't reach on its own.
PluginsReady-made bundles of the other three, installed in one step.
More coming soonNew kinds of tools will join this list as the book grows.

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CurriculumStage 2 — SDE Mastery (AI-Native)

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Chapter 02Stage 2 — SDE Mastery (AI-Native)

Multi-Agent Systems

Curriculum