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ReAct (Reasoning + Acting)
Thought → Action → Observation loop. Foundation of tool use and agents.
3 hours2 resources1 prereqs
The model writes a 'thought', picks an 'action' (tool call), gets an 'observation' back, writes a new thought… until done.
Why it matters: Beyond closed-loop reasoning, ReAct lets the model pull info from the real world to solve problems. Foundation of modern tool-use APIs (Anthropic tools, OpenAI function calling).