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Agent Archetypes
Reactive, Deliberative, Hybrid, BDI — agent behavioral architectures.
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Reactive Agent: decisions based only on current input. No plan, fast. Example: spam classifier.
Deliberative Agent: builds a long-term plan, maintains a world model, derives subgoals. Example: research agent.
Hybrid Agent: reactive lower layer (urgent), deliberative upper layer (long-term). Most modern LLM agents = hybrid.
BDI (Belief-Desire-Intention): from classical AI. Belief = world model, Desire = goal, Intention = chosen plan. Modern frameworks like LangGraph + Pydantic AI follow this mental model.
Practical: most LLM agents fall in the hybrid category — moment-to-moment tool selection is reactive, upper-layer planning is deliberative.