This guide explains how LangChain structures interactions with chat models using role‑based Message objects—HumanMessage, AIMessage, SystemMessage, ToolMessage, and others—detailing their purposes, code examples, and how they enable multi‑turn AI agent workflows.
This article explains why prompt templates are essential for LLM interactions, compares LangChain's PromptTemplate and ChatPromptTemplate, and walks through a complete Python example that prepares the environment, builds reusable templates, formats messages, and integrates them into an LCEL chain for chat models.
This article explains why and how to create custom LLM and chat model wrappers in LangChain by inheriting base classes, implementing core methods like _call and _generate, and demonstrates a full example with an echo‑based chat model, including streaming support and testing benefits.
This article explains LangChain's two core abstractions—LLM for simple text completion and ChatModel for multi‑turn conversational AI—detailing their input/output formats, practical code examples, and why ChatModel is generally preferred for modern dialogue applications.
This article walks through Spring AI’s three core classes—Message, Prompt, and ChatModel—explaining their roles, showing concrete code examples for constructing messages, building prompts, and invoking a large language model via a REST controller, and provides a complete demo repository.
This article introduces the LangChain framework for large language model integration, explains its key components and advantages, and provides step‑by‑step Python examples for setting up environment variables, creating prompts, chaining models, and using embeddings, completions, and chat models.
