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ReAct Agent Loop from Scratch: Manual Implementation vs LangChain

This story is from 2026-08-28. It is preserved in the archive; the latest stories are on the live feed.

What Is ReAct, and Why Should You Care? ReAct (Reason + Act) is the pattern that powers virtually every modern AI agent. Instead of sending a single prompt to an LLM and hoping for the best, the agent loops: Thought — the LLM reasons about what to do next Action — it picks a tool to call Observatio…

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  1. 2026-08-28 17:45 · DEV Community — AI
    ReAct Agent Loop from Scratch: Manual Implementation vs LangChain

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