> ## Documentation Index
> Fetch the complete documentation index at: https://agency-swarm.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Pydantic is All You Need

> How Pydantic solved AI agent reliability.

The idea of using Pydantic to validate tool calls and responses is not new. It was popularized by Jason Liu in his library called [Instructor](https://github.com/instructor-ai/instructor).

To really understand why it's such a game changer, we recommend watching this video:

<iframe width="100%" height="400" src="https://www.youtube.com/embed/yj-wSRJwrrc" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen />

## Learn more

To take your tools to the next level, we highly recommend the following resources:

* [Pydantic Models Documentation](https://docs.pydantic.dev/latest/concepts/models/)
* [Instructor Concepts](https://python.useinstructor.com/concepts/)
* [Instructor Tips & Tricks](https://python.useinstructor.com/tutorials/2-tips/)
* [Instructor Cookbook](https://python.useinstructor.com/examples/)