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Hierarchical Task Networks (HTN)
Goal → sub-goal → primitive action tree. Classical AI planning + LLM.
3 hours1 prereqs
Classical AI's HTN applied to LLM agents: high-level goal → mid-level tasks → primitive tool calls.
Pro: doesn't lose the big picture on complex tasks. Re-planning only on affected subtree.
Practical: Auto-GPT's "Goals → Tasks → Steps" is a simple version. Modern: LangGraph subgraph composition.