Agent frameworks & harnesses · CrewAI
CrewAI
Framework for role-based multi-agent workflows, with open-source libraries and a commercial platform described by the vendor.
Open sourceFreemiumPaid
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Agent frameworks & harnesses · Google
Google ADK
Google's open-source Agent Development Kit. You write an agent in code, give it tools, and can grow it into a multi-agent workflow. It is available in Python, TypeScript, Go, Java, and Kotlin.
Open source
Agent frameworks & harnesses · LangChain
LangChain
Open-source framework and commercial platform (LangSmith and related products) for composing language-model applications and agents.
Open sourceFreemiumPaid
Agent frameworks & harnesses · Microsoft
Microsoft Agent Framework
Microsoft's open-source framework for building agents and multi-agent workflows in Python and .NET, with a Go SDK in public preview. It includes a ready-made harness for long tasks and graph workflows when you want fixed steps.
Open source
Agent frameworks & harnesses · OpenAI
OpenAI Agents SDK
An open-source toolkit for building agents in Python and TypeScript. It runs the loop that calls a model, uses tools, hands work to another agent, and stops when the task is done.
Open sourcePaid
Agent frameworks & harnesses · Pydantic
Pydantic AI
A Python framework for typed agents. You name a model, add tools, and get answers checked against a schema. A separate harness package adds files, a shell, and planning for longer jobs.
Open source
Agent frameworks & harnesses · Hugging Face
smolagents
A small open-source Python library from Hugging Face for building agents. Its code agent writes Python to call tools and do math, instead of only returning text.
Open source