# 03 - LangChain and LangGraph: Agents with AgentExecutor and Tools

Building AI Agents with LangChain and LangGraph 1.0: from AgentExecutor to stateful graphs. Tools, chains and the new production standard for LLM agents.

## What you'll learn

- Core Components
- Package Structure
- How AgentExecutor Worked
- Why AgentExecutor Was Deprecated
- Key LangGraph Concepts

*This article is part of the **AI Agents** series on federicocalo.dev.*

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**[Read the full article (16 min)](https://federicocalo.dev/en/blog/langchain-agents-agentexecutor-tools-chain)**

The complete article includes code examples, diagrams, and practical exercises.

*Originally published on [federicocalo.dev](https://federicocalo.dev)*