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AG2 (formerly AutoGen)

What it is

AG2 is the next-generation evolution of the AutoGen framework. It is an open-source framework for building multi-agent AI applications that can converse with each other and interact with tools and environments.

What problem it solves

It simplifies the development of complex AI systems where multiple agents need to collaborate, reason, and act to solve sophisticated problems.

Where it fits in the stack

Framework / Multi-Agent Orchestrator.

Typical use cases

  • Multi-agent Collaboration: Building teams of agents to perform research, coding, and review.
  • Complex Problem Solving: Breaking down difficult tasks into smaller parts handled by specialized agents.
  • Human-Agent Interaction: Creating applications where humans and AI agents work together seamlessly.

Strengths

  • Conversational Design: Excellent support for natural language interactions between agents.
  • Flexible Orchestration: Supports various patterns of agent communication and coordination.
  • Large Community: Inherits a large and active community from the AutoGen project.

Limitations

  • Evolving API: As a newer project (though based on AutoGen), the API may undergo changes.
  • Abstraction Depth: Like most frameworks, it introduces abstractions that may hide underlying complexity.

When to use it

  • When you want to build sophisticated multi-agent systems based on a proven foundation.
  • When you need a framework that supports complex, conversational AI workflows.

When not to use it

  • For simple, single-agent tasks.
  • If you prefer a more rigid or non-conversational orchestration model.

Getting started

Installation

pip install "ag2[openai]"

Basic Example

import autogen

config_list = [{"model": "gpt-4", "api_key": "YOUR_API_KEY"}]

assistant = autogen.AssistantAgent(
    "assistant",
    llm_config={"config_list": config_list}
)

user_proxy = autogen.UserProxyAgent(
    "user_proxy",
    code_execution_config={"work_dir": "coding", "use_docker": False}
)

user_proxy.initiate_chat(
    assistant,
    message="Tell me a joke about autonomous agents."
)

Licensing and cost

  • Open Source: Yes (Apache 2.0 License)
  • Cost: Free
  • Self-hostable: Yes

Sources / References

Contribution Metadata

  • Last reviewed: 2026-05-07
  • Confidence: high