# Agent frameworks and SDKs

> Developer frameworks for AI agents explained and compared: Claude Agent SDK, OpenAI Agents SDK, LangGraph, CrewAI, AutoGen, LlamaIndex, Pydantic AI and MCP SDKs.

Canonical URL: https://www.ruebstudio.de/en/guides/agent-frameworks

## Fundamentals

- [Choosing an AI Agent Framework: An Honest Comparison for Mid-Sized Companies](https://www.ruebstudio.de/en/guides/agent-frameworks/ai-agent-frameworks-comparison.md): AI agent frameworks comparison for mid-sized firms: LangGraph, CrewAI, Claude Agent SDK, OpenAI, Microsoft and Google ADK rated on five practical criteria.