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ReAct names the agent cycle you already built: think, act with a tool, observe the result, then repeat until a final answer.
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ReAct Pattern
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ReAct Pattern
Contract
- Put your API key in the practice file (fine for local learning)
- Create an authenticated client
- Declare two tools: read_file and get_time
- Run the tool-call loop; print Thought / Action / Observation labels
- Stop on final answer or max steps
react_demo.py
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Example console
Sample run — exact text can vary
--- step 1 ---
Thought: (not shown as text — model went straight to a tool call)
Action: read_file({'path': 'notes.txt'})
Observation: Milk, eggs, buy cat food. Dentist Tuesday 3pm.
Action: get_time({})
Observation: 2026-07-27 16:30
--- step 2 ---
Thought: (not shown as text — model went straight to a tool call)
Final answer:
notes.txt has a shopping list and a dentist reminder. The time is 2026-07-27 16:30.