Pydantic AI vs Smolagents: Which Agent Framework to Use?

Pydantic AI and Smolagents both let you build an agent, but they sit in different parts of the stack and they assume different things about who's writing the code.

Pydantic AI is a type-safe agent framework built by the Pydantic team.

Smolagents is HuggingFace's minimalist agent library.

Underneath, both wrap the same thing: a model call, a tool dispatch, a loop. The decision is about which abstraction your team wants to think in day to day, and which ecosystem you're willing to inherit along with it. There's an honest, framework-free version of the same pattern in about 60 lines of Python in the lesson at the bottom of this page — useful as a baseline regardless of which framework wins.

Pick Pydantic AI if pydantic AI adds genuine value if you want compile-time type checking across your agent's tools, outputs, and dependencies. If you already use Pydantic in your stack, it fits naturally. But the core agent logic — loop, dispatch, validate — is still ~60 lines of Python you can own entirely. The tradeoffs in its intro should match how your team already thinks about agents; Smolagents will feel like translation if they don't.

Pick Smolagents if smolagents lives up to its name — it's genuinely minimal and the code-agent approach is a real innovation that reduces LLM calls by ~30%. If you want a lightweight agent library with HuggingFace ecosystem access, it's excellent. For understanding the fundamentals, the plain version is even simpler. The tradeoffs in its intro should match how your team already thinks about agents; Pydantic AI will feel like translation if they don't.

Whichever you pick, you're inheriting a dependency tree and a vocabulary your team has to learn before they ship anything. Pydantic AI has its own class hierarchy and tool registration conventions; Smolagents has its. Either way, when something misbehaves you'll be reading framework source before you reach the actual HTTP call.

If the real workload is one model and a handful of tools, both can feel like a workbench for driving a nail. The lesson below builds the same pattern in plain Python — useful as a comparison point even if you ultimately keep the framework.