LangChain

Summary

A widely-used framework for chaining LLM calls, tools, memory and retrieval into structured applications — helpful for prototyping though often criticized for abstraction overhead at scale.

• 1Build a simple chain and a simple agent using LangChain's core abstractions.
• 2Learn LangChain's building blocks: chains, tools, memory, retrievers.
• 3Understand when going 'framework-free' with raw API calls is actually simpler for your use case.