Agent frameworksOpen source

smolagents

by Hugging Face

A small, simple library for building agents in a few lines.

Prices and features change often — check the official site for current plans. This listing is not an endorsement.

Best for

Learning how agents work with little code.

How to choose · Agent frameworks

Start with the simplest loop you can write yourself. Adopt a framework only for a feature you need, and keep your own logic separate.

Learn to use tools like this

A shared standard for connecting AI apps to tools and data.

Google's open toolkit for building and running agents.

Build teams of AI agents with defined roles.

Popular code libraries for building AI apps, including LangGraph for step-by-step agent flows.