Pydantic
Pydantic AI
Python agent framework built around typed, validated tools and outputs, with a separate graph library for complex control flow.
Install
Run in your terminal
pip install pydantic-ai
Latest version read from pypi package pydantic-ai.
Multi-agent patterns
Handoffs
One agent passes the conversation to another agent, which takes over.
How Pydantic AI does itSubagents / agents as tools
A main agent calls other agents like tools and gets their result back, each with its own context.
How Pydantic AI does itGraph or workflow
You define steps and edges (or a workflow), and the framework runs agents and functions through them.
How Pydantic AI does itGroup chat / crew
Several agents with roles work together on a task, coordinated by a manager or a selection rule.
Not shown in the docs.
Human in the loop
The run pauses for a person to approve, edit or answer before it continues.
How Pydantic AI does itProtocols and hosting
Hosted runtime
Self-hosted only (none documented)
Questions
Does Pydantic AI support MCP?
Yes. Pydantic AI's documentation shows agents using tools from MCP servers.
Does Pydantic AI support the A2A protocol?
Its documentation does not cover A2A as of 2026-10-07.
What multi-agent patterns does Pydantic AI support?
The docs show: handoffs, subagents / agents as tools, graph or workflow, human in the loop.
Links
Alternatives in the same languages
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Reviewed Oct 7, 2026.