From LLMs to LangChain: Understanding How Modern AI Applications Actually Work
SMRTR summary
Building real AI apps means going beyond simple prompt-response loops. This practical guide walks through how LLMs connect to external tools, how MCP (Model Context Protocol) standardizes tool exposure, and how LangChain orchestrates multi-step workflows — all using Node.js examples. The author also shares an open-source toolkit that reduces the usual boilerplate wiring.
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