langchain

Orchestrate LLM applications with LCEL chains, LangGraph agents, and RAG pipelines.

40|6|Updated Jul 11, 2026
One-click install
npx skills add https://github.com/magnus919/agent-skills --skill langchain-magnus919
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: langchain
Source: https://github.com/magnus919/agent-skills/tree/main/langchain
Command: npx skills add https://github.com/magnus919/agent-skills --skill langchain-magnus919

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires langchain, langchain-core, langchain-openai, langchain-community, langserve, fastapi, uvicorn, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This skill addresses the complexity of orchestrating LLM applications by providing a standardized, modular framework for building chains, agents, and RAG pipelines that are observable and production-ready.

Core Features & Use Cases

  • LCEL Composition: Build complex LLM workflows using the pipe operator for clean, readable, and modular code.
  • Agent Orchestration: Create tool-using agents powered by the LangGraph runtime for streaming, persistence, and state management.
  • Production Observability: Integrate LangSmith tracing to debug agent behavior, monitor latency, and evaluate performance in real-time.
  • Use Case: Quickly prototype a RAG-based customer support bot that retrieves documentation, uses tools to check order status, and logs all interactions for quality assurance.

Quick Start

Use the langchain skill to initialize a basic LCEL chain that prompts a model to answer a specific question.

Frequently Asked Questions about langchain

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I build production-ready LLM apps with LangChain?▼

Build production-ready LLM apps with LangChain by orchestrating modular components through LCEL chain composition, LangGraph agent creation, and RAG pipeline implementation for enterprise-grade AI scenarios.

What is the best way to create tool-using agents using LangGraph?▼

Create tool-using agents with LangGraph by leveraging its runtime for state management, streaming event handling, and persistent memory, enabling complex multi-step reasoning workflows.

How do I implement a RAG pipeline for an LLM application?▼

Implement a RAG pipeline using LCEL composition to connect retrieval components with language models, enabling applications like customer support bots to retrieve documentation and use external tools.

Can I integrate LangSmith tracing for LLM observability?▼

Integrate LangSmith tracing to achieve production observability, allowing you to debug agent behavior, monitor latency, and evaluate LLM performance in real-time.

Does LangChain support streaming event handling in FastAPI?▼

LangChain supports streaming event handling through LangServe and FastAPI integration, allowing you to deploy modular LCEL chains and LangGraph agents as production-ready APIs.

Why use LCEL composition for complex LLM workflows?▼

Use LCEL composition to build complex LLM workflows with the pipe operator, resulting in clean, readable, and modular code that supports framework-neutral evaluation and standardized integration.